Solve 8x + 8 = −56

The solution of 8x + 8 = −56 is x = -8.

8x + 8 = -56\ \Rightarrow\ x = -8

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The lines y = 8x + 8 and y = -56 meet at x = -8. 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 addition, then the multiplication.
$8x + 8 = -56$
2
Subtract 8 from both sides:
$8x + 8 - 8 = -56 - 8 \ \Rightarrow\ 8x = -64$
3
Divide both sides by 8:
$\frac{8x}{8} = \frac{-64}{8} \ \Rightarrow\ x = -8$
4
Check: put x = -8 back into the equation.
$8\cdot(-8) + 8 = -64 + 8 = -56 \checkmark$

LaTeX source of the formulas on this page

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

Trying values of x in 8x + 8 = −56

x	8x + 8	Equals -56?
-10	-72	no
-9	-64	no
-8	-56	yes
-7	-48	no
-6	-40	no

Questions

What is x in 8x + 8 = −56?

The solution of 8x + 8 = −56 is x = -8.

How do you solve 8x + 8 = −56?

Subtract 8 from both sides to get 8x = -64, then divide both sides by 8 to get x = -8.

How do I check the answer?

Replace x by -8: 8(-8) + 8 = -56, which is -56.

Solve 8x + 8 = −56

How to work it out

Trying values of x in 8x + 8 = −56

Questions

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