Two Step Equations 2

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Year 8

Equations

Two Step Equations

Two Step Equations 2

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Question 1 of 5

1. Question
Solve

$3 a + 4 = - 8$ $3a+4=-8$
- $a =$ $a=$ (-4)
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Inverse Operations

When moving a term to the other side of an equation, the operation is inversed.

To solve for $a$ $a$ , it needs to be alone on one side.

Start by moving $4$ $4$ to the other side by subtracting $4$ $4$ from both sides of the equation.

$3$ $3$ $a$ $a$ $+ 4$ $+4$ $=$ $=$ $- 8$ $-8$

$3$ $3$ $a$ $a$ $+ 4$ $+4$ $- 4$ $-4$ $=$ $=$ $- 8$ $-8$ $- 4$ $-4$

$3$ $3$ $a$ $a$ $=$ $=$ $- 12$ $-12$ $4 - 4$ $4-4$ cancels out

Next, remove $3$ $3$ by dividing both sides of the equation by $3$ $3$ .

$3$ $3$ $a$ $a$ $=$ $=$ $- 12$ $-12$

$3$ $3$ $a$ $a$ $\div 3$ $-:3$ $=$ $=$ $- 12$ $-12$ $\div 3$ $-:3$

$a$ $a$ $=$ $=$ $- 4$ $-4$ $3 \div 3$ $3-:3$ cancels out

Check our work

To confirm our answer, substitute $a = - 4$ $a=-4$ to the original equation.

$3 a + 4$ $3a+4$ $=$ $=$ $- 8$ $-8$

$3 (- 4) + 4$ $3(-4)+4$ $=$ $=$ $- 8$ $-8$ Substitute $a = - 4$ $a=-4$

$- 12 + 4$ $-12+4$ $=$ $=$ $- 8$ $-8$

$- 8$ $-8$ $=$ $=$ $- 8$ $-8$

Since the equation is true, the answer is correct.

$a = - 4$ $a=-4$
Question 2 of 5

2. Question
Solve

$- 7 x + 8 = - 6$ $-7x+8=-6$
- $x =$ $x=$ (2)
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Inverse Operations

When moving a term to the other side of an equation, the operation is inversed.

To solve for $x$ $x$ , it needs to be alone on one side.

Start by moving $8$ $8$ to the other side by subtracting $8$ $8$ from both sides of the equation.

$- 7$ $-7$ $x$ $x$ $+ 8$ $+8$ $=$ $=$ $- 6$ $-6$

$- 7$ $-7$ $x$ $x$ $+ 8$ $+8$ $- 8$ $-8$ $=$ $=$ $- 6$ $-6$ $- 8$ $-8$

$- 7$ $-7$ $x$ $x$ $=$ $=$ $- 14$ $-14$ $8 - 8$ $8-8$ cancels out

Next, remove $- 7$ $-7$ by dividing both sides of the equation by $- 7$ $-7$ .

$- 7$ $-7$ $x$ $x$ $=$ $=$ $- 14$ $-14$

$- 7$ $-7$ $x$ $x$ $\div - 7$ $-:-7$ $=$ $=$ $- 14$ $-14$ $\div - 7$ $-:-7$

$x$ $x$ $=$ $=$ $2$ $2$ $- 7 \div - 7$ $-7-:-7$ cancels out

Check our work

To confirm our answer, substitute $x = 2$ $x=2$ to the original equation.

$- 7 x + 8$ $-7x+8$ $=$ $=$ $- 6$ $-6$

$- 7 (2) + 8$ $-7(2)+8$ $=$ $=$ $- 6$ $-6$ Substitute $x = 2$ $x=2$

$- 14 + 8$ $-14+8$ $=$ $=$ $- 6$ $-6$

$- 6$ $-6$ $=$ $=$ $- 6$ $-6$

Since the equation is true, the answer is correct.

$x = 2$ $x=2$
Question 3 of 5

3. Question
Solve for $m$ $m$

$2 m + 9 = 23$ $2m+9=23$
- $m =$ $m=$ (7)
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To solve for $m$ $m$ , get $m$ $m$ by itself

Subtract $9$ $9$ from both sides of the equation

$2 m + 9$ $2m+9$ $- 9$ $-9$ $=$ $=$ $23$ $23$ $- 9$ $-9$

$2 m$ $2m$ $+ 9$ $+9$ $- 9$ $-9$ $=$ $=$ $23$ $23$ $- 9$ $-9$ $9 - 9$ $9-9$ cancels out

$2 m$ $2m$ $=$ $=$ $14$ $14$

Finally, divide both sides of the equation by $2$ $2$

$2 m$ $2m$ $\div 2$ $divide2$ $=$ $=$ $14$ $14$ $\div 2$ $divide2$

$2$ $2$ $m$ $m$ $\div 2$ $divide2$ $=$ $=$ $14$ $14$ $\div 2$ $divide2$ $\times 2 \div 2$ $times2divide2$ cancels out

$m$ $m$ $=$ $=$ $7$ $7$

$m = 7$ $m=7$
Question 4 of 5

4. Question
Solve for $a$ $a$

$3 a + 5 = - 10$ $3a+5=-10$
- $a =$ $a=$ (-5)
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To solve for $a$ $a$ , get $a$ $a$ by itself

Subtract $5$ $5$ from both sides of the equation

$3 a + 5$ $3a+5$ $- 5$ $-5$ $=$ $=$ $- 10$ $-10$ $- 5$ $-5$

$3 a$ $3a$ $+ 5$ $+5$ $- 5$ $-5$ $=$ $=$ $- 10$ $-10$ $- 5$ $-5$ $5 - 5$ $5-5$ cancels out

$3 a$ $3a$ $=$ $=$ $- 15$ $-15$

Finally, divide both sides of the equation by $3$ $3$

$3 a$ $3a$ $\div 3$ $divide3$ $=$ $=$ $- 15$ $-15$ $\div 3$ $divide3$

$3$ $3$ $a$ $a$ $\div 3$ $divide3$ $=$ $=$ $- 15$ $-15$ $\div 3$ $divide3$ $\times 3 \div 3$ $times3divide3$ cancels out

$a$ $a$ $=$ $=$ $- 5$ $-5$

$a = - 5$ $a=-5$
Question 5 of 5

5. Question
Solve for $p$ $p$

$- 1 + 5 p = - 16$ $-1+5p=-16$
- $p =$ $p=$ (-3)
Correct

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Incorrect

To solve for $p$ $p$ , get $p$ $p$ by itself

Add $1$ $1$ to both sides of the equation

$- 1 + 5 p$ $-1+5p$ $+ 1$ $+1$ $=$ $=$ $- 16$ $-16$ $+ 1$ $+1$

$- 1$ $-1$ $+ 5 p$ $+5p$ $+ 1$ $+1$ $=$ $=$ $- 16$ $-16$ $+ 1$ $+1$ $- 1 + 1$ $-1+1$ cancels out

$5 p$ $5p$ $=$ $=$ $- 15$ $-15$

Finally, divide both sides of the equation by $5$ $5$

$5 p$ $5p$ $\div 5$ $-:5$ $=$ $=$ $- 15$ $-15$ $\div 5$ $-:5$

$5$ $5$ $p$ $p$ $\div 5$ $divide5$ $=$ $=$ $- 15$ $-15$ $\div 5$ $-:5$ $\times 5 \div 5$ $times5divide5$ cancels out

$p$ $p$ $=$ $=$ $- 3$ $-3$

$p = - 3$ $p=-3$

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Quiz summary

Information

1. Question

Hint

Great Work!

Inverse Operations

2. Question

Hint

Well Done!

Inverse Operations

3. Question

Hint

Great Work!

4. Question

Hint

Keep Going!

5. Question

Excellent!

Quizzes

$3$ $3$ $a$ $a$ $+ 4$ $+4$	$=$ $=$	$- 8$ $-8$
$3$ $3$ $a$ $a$ $+ 4$ $+4$ $- 4$ $-4$	$=$ $=$	$- 8$ $-8$ $- 4$ $-4$
$3$ $3$ $a$ $a$	$=$ $=$	$- 12$ $-12$	$4 - 4$ $4-4$ cancels out

$3 a + 4$ $3a+4$	$=$ $=$	$- 8$ $-8$
$3 (- 4) + 4$ $3(-4)+4$	$=$ $=$	$- 8$ $-8$	Substitute $a = - 4$ $a=-4$
$- 12 + 4$ $-12+4$	$=$ $=$	$- 8$ $-8$
$- 8$ $-8$	$=$ $=$	$- 8$ $-8$

$- 7$ $-7$ $x$ $x$ $+ 8$ $+8$	$=$ $=$	$- 6$ $-6$
$- 7$ $-7$ $x$ $x$ $+ 8$ $+8$ $- 8$ $-8$	$=$ $=$	$- 6$ $-6$ $- 8$ $-8$
$- 7$ $-7$ $x$ $x$	$=$ $=$	$- 14$ $-14$	$8 - 8$ $8-8$ cancels out

$- 7 x + 8$ $-7x+8$	$=$ $=$	$- 6$ $-6$
$- 7 (2) + 8$ $-7(2)+8$	$=$ $=$	$- 6$ $-6$	Substitute $x = 2$ $x=2$
$- 14 + 8$ $-14+8$	$=$ $=$	$- 6$ $-6$
$- 6$ $-6$	$=$ $=$	$- 6$ $-6$

$2 m + 9$ $2m+9$ $- 9$ $-9$	$=$ $=$	$23$ $23$ $- 9$ $-9$
$2 m$ $2m$ $+ 9$ $+9$ $- 9$ $-9$	$=$ $=$	$23$ $23$ $- 9$ $-9$	$9 - 9$ $9-9$ cancels out
$2 m$ $2m$	$=$ $=$	$14$ $14$

$2 m$ $2m$ $\div 2$ $divide2$	$=$ $=$	$14$ $14$ $\div 2$ $divide2$
$2$ $2$ $m$ $m$ $\div 2$ $divide2$	$=$ $=$	$14$ $14$ $\div 2$ $divide2$	$\times 2 \div 2$ $times2divide2$ cancels out
$m$ $m$	$=$ $=$	$7$ $7$

$3 a + 5$ $3a+5$ $- 5$ $-5$	$=$ $=$	$- 10$ $-10$ $- 5$ $-5$
$3 a$ $3a$ $+ 5$ $+5$ $- 5$ $-5$	$=$ $=$	$- 10$ $-10$ $- 5$ $-5$	$5 - 5$ $5-5$ cancels out
$3 a$ $3a$	$=$ $=$	$- 15$ $-15$

$3 a$ $3a$ $\div 3$ $divide3$	$=$ $=$	$- 15$ $-15$ $\div 3$ $divide3$
$3$ $3$ $a$ $a$ $\div 3$ $divide3$	$=$ $=$	$- 15$ $-15$ $\div 3$ $divide3$	$\times 3 \div 3$ $times3divide3$ cancels out
$a$ $a$	$=$ $=$	$- 5$ $-5$

$- 1 + 5 p$ $-1+5p$ $+ 1$ $+1$	$=$ $=$	$- 16$ $-16$ $+ 1$ $+1$
$- 1$ $-1$ $+ 5 p$ $+5p$ $+ 1$ $+1$	$=$ $=$	$- 16$ $-16$ $+ 1$ $+1$	$- 1 + 1$ $-1+1$ cancels out
$5 p$ $5p$	$=$ $=$	$- 15$ $-15$

$5 p$ $5p$ $\div 5$ $-:5$	$=$ $=$	$- 15$ $-15$ $\div 5$ $-:5$
$5$ $5$ $p$ $p$ $\div 5$ $divide5$	$=$ $=$	$- 15$ $-15$ $\div 5$ $-:5$	$\times 5 \div 5$ $times5divide5$ cancels out
$p$ $p$	$=$ $=$	$- 3$ $-3$