Solve 8x − 8 = 64

The solution of 8x − 8 = 64 is x = 9.

8x - 8 = 64\ \Rightarrow\ x = 9

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The lines y = 8x − 8 and y = 64 meet at x = 9. 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:
$8x - 8 + 8 = 64 + 8 \ \Rightarrow\ 8x = 72$
3
Divide both sides by 8:
$\frac{8x}{8} = \frac{72}{8} \ \Rightarrow\ x = 9$
4
Check: put x = 9 back into the equation.
$8\cdot9 - 8 = 72 - 8 = 64 \checkmark$

LaTeX source of the formulas on this page

\[ 8x - 8 = 64\ \Rightarrow\ x = 9 \]
\[ 8x - 8 = 64 \]
\[ 8x - 8 + 8 = 64 + 8 \ \Rightarrow\ 8x = 72 \]
\[ \frac{8x}{8} = \frac{72}{8} \ \Rightarrow\ x = 9 \]
\[ 8\cdot9 - 8 = 72 - 8 = 64 \checkmark \]

Trying values of x in 8x − 8 = 64

x	8x − 8	Equals 64?
7	48	no
8	56	no
9	64	yes
10	72	no
11	80	no

Questions

What is x in 8x − 8 = 64?

The solution of 8x − 8 = 64 is x = 9.

How do you solve 8x − 8 = 64?

Add 8 to both sides to get 8x = 72, then divide both sides by 8 to get x = 9.

How do I check the answer?

Replace x by 9: 8(9) − 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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