Solve 8x − 12 = −4

The solution of 8x − 12 = −4 is x = 1.

8x - 12 = -4\ \Rightarrow\ x = 1

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The lines y = 8x − 12 and y = -4 meet at x = 1. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

1
The goal is to get x alone. Undo the operations in the opposite order: first the subtraction, then the multiplication.
$8x - 12 = -4$
2
Add 12 to both sides:
$8x - 12 + 12 = -4 + 12 \ \Rightarrow\ 8x = 8$
3
Divide both sides by 8:
$\frac{8x}{8} = \frac{8}{8} \ \Rightarrow\ x = 1$
4
Check: put x = 1 back into the equation.
$8\cdot1 - 12 = 8 - 12 = -4 \checkmark$

LaTeX source of the formulas on this page

\[ 8x - 12 = -4\ \Rightarrow\ x = 1 \]
\[ 8x - 12 = -4 \]
\[ 8x - 12 + 12 = -4 + 12 \ \Rightarrow\ 8x = 8 \]
\[ \frac{8x}{8} = \frac{8}{8} \ \Rightarrow\ x = 1 \]
\[ 8\cdot1 - 12 = 8 - 12 = -4 \checkmark \]

Trying values of x in 8x − 12 = −4

x	8x − 12	Equals -4?
-1	-20	no
0	-12	no
1	-4	yes
2	4	no
3	12	no

Questions

What is x in 8x − 12 = −4?

The solution of 8x − 12 = −4 is x = 1.

How do you solve 8x − 12 = −4?

Add 12 to both sides to get 8x = 8, then divide both sides by 8 to get x = 1.

How do I check the answer?

Replace x by 1: 8(1) − 12 = -4, which is -4.

Solve 8x − 12 = −4

How to work it out

Trying values of x in 8x − 12 = −4

Questions

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