Solve 10x + 8 = −82

The solution of 10x + 8 = −82 is x = -9.

10x + 8 = -82\ \Rightarrow\ x = -9

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The lines y = 10x + 8 and y = -82 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 addition, then the multiplication.
$10x + 8 = -82$
2
Subtract 8 from both sides:
$10x + 8 - 8 = -82 - 8 \ \Rightarrow\ 10x = -90$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{-90}{10} \ \Rightarrow\ x = -9$
4
Check: put x = -9 back into the equation.
$10\cdot(-9) + 8 = -90 + 8 = -82 \checkmark$

LaTeX source of the formulas on this page

\[ 10x + 8 = -82\ \Rightarrow\ x = -9 \]
\[ 10x + 8 = -82 \]
\[ 10x + 8 - 8 = -82 - 8 \ \Rightarrow\ 10x = -90 \]
\[ \frac{10x}{10} = \frac{-90}{10} \ \Rightarrow\ x = -9 \]
\[ 10\cdot(-9) + 8 = -90 + 8 = -82 \checkmark \]

Trying values of x in 10x + 8 = −82

x	10x + 8	Equals -82?
-11	-102	no
-10	-92	no
-9	-82	yes
-8	-72	no
-7	-62	no

Questions

What is x in 10x + 8 = −82?

The solution of 10x + 8 = −82 is x = -9.

How do you solve 10x + 8 = −82?

Subtract 8 from both sides to get 10x = -90, then divide both sides by 10 to get x = -9.

How do I check the answer?

Replace x by -9: 10(-9) + 8 = -82, which is -82.

Solve 10x + 8 = −82

How to work it out

Trying values of x in 10x + 8 = −82

Questions

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