Solve 10x − 10 = −100

The solution of 10x − 10 = −100 is x = -9.

10x - 10 = -100\ \Rightarrow\ x = -9

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The lines y = 10x − 10 and y = -100 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.
$10x - 10 = -100$
2
Add 10 to both sides:
$10x - 10 + 10 = -100 + 10 \ \Rightarrow\ 10x = -90$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{-90}{10} \ \Rightarrow\ x = -9$
4
Check: put x = -9 back into the equation.
$10\cdot(-9) - 10 = -90 - 10 = -100 \checkmark$

LaTeX source of the formulas on this page

\[ 10x - 10 = -100\ \Rightarrow\ x = -9 \]
\[ 10x - 10 = -100 \]
\[ 10x - 10 + 10 = -100 + 10 \ \Rightarrow\ 10x = -90 \]
\[ \frac{10x}{10} = \frac{-90}{10} \ \Rightarrow\ x = -9 \]
\[ 10\cdot(-9) - 10 = -90 - 10 = -100 \checkmark \]

Trying values of x in 10x − 10 = −100

x	10x − 10	Equals -100?
-11	-120	no
-10	-110	no
-9	-100	yes
-8	-90	no
-7	-80	no

Questions

What is x in 10x − 10 = −100?

The solution of 10x − 10 = −100 is x = -9.

How do you solve 10x − 10 = −100?

Add 10 to 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) − 10 = -100, which is -100.

Solve 10x − 10 = −100

How to work it out

Trying values of x in 10x − 10 = −100

Questions

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