Solve 8x − 8 = −64

The solution of 8x − 8 = −64 is x = -7.

8x - 8 = -64\ \Rightarrow\ x = -7

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The lines y = 8x − 8 and y = -64 meet at x = -7. 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.
$8x - 8 = -64$
2
Add 8 to both sides:
$8x - 8 + 8 = -64 + 8 \ \Rightarrow\ 8x = -56$
3
Divide both sides by 8:
$\frac{8x}{8} = \frac{-56}{8} \ \Rightarrow\ x = -7$
4
Check: put x = -7 back into the equation.
$8\cdot(-7) - 8 = -56 - 8 = -64 \checkmark$

LaTeX source of the formulas on this page

\[ 8x - 8 = -64\ \Rightarrow\ x = -7 \]
\[ 8x - 8 = -64 \]
\[ 8x - 8 + 8 = -64 + 8 \ \Rightarrow\ 8x = -56 \]
\[ \frac{8x}{8} = \frac{-56}{8} \ \Rightarrow\ x = -7 \]
\[ 8\cdot(-7) - 8 = -56 - 8 = -64 \checkmark \]

Trying values of x in 8x − 8 = −64

x	8x − 8	Equals -64?
-9	-80	no
-8	-72	no
-7	-64	yes
-6	-56	no
-5	-48	no

Questions

What is x in 8x − 8 = −64?

The solution of 8x − 8 = −64 is x = -7.

How do you solve 8x − 8 = −64?

Add 8 to both sides to get 8x = -56, then divide both sides by 8 to get x = -7.

How do I check the answer?

Replace x by -7: 8(-7) − 8 = -64, which is -64.

Solve 8x − 8 = −64

How to work it out

Trying values of x in 8x − 8 = −64

Questions

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