Solve 11x − 11 = 99

The solution of 11x − 11 = 99 is x = 10.

11x - 11 = 99\ \Rightarrow\ x = 10

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The lines y = 11x − 11 and y = 99 meet at x = 10. 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.
$11x - 11 = 99$
2
Add 11 to both sides:
$11x - 11 + 11 = 99 + 11 \ \Rightarrow\ 11x = 110$
3
Divide both sides by 11:
$\frac{11x}{11} = \frac{110}{11} \ \Rightarrow\ x = 10$
4
Check: put x = 10 back into the equation.
$11\cdot10 - 11 = 110 - 11 = 99 \checkmark$

LaTeX source of the formulas on this page

\[ 11x - 11 = 99\ \Rightarrow\ x = 10 \]
\[ 11x - 11 = 99 \]
\[ 11x - 11 + 11 = 99 + 11 \ \Rightarrow\ 11x = 110 \]
\[ \frac{11x}{11} = \frac{110}{11} \ \Rightarrow\ x = 10 \]
\[ 11\cdot10 - 11 = 110 - 11 = 99 \checkmark \]

Trying values of x in 11x − 11 = 99

x	11x − 11	Equals 99?
8	77	no
9	88	no
10	99	yes
11	110	no
12	121	no

Questions

What is x in 11x − 11 = 99?

The solution of 11x − 11 = 99 is x = 10.

How do you solve 11x − 11 = 99?

Add 11 to both sides to get 11x = 110, then divide both sides by 11 to get x = 10.

How do I check the answer?

Replace x by 10: 11(10) − 11 = 99, which is 99.

Solve 11x − 11 = 99

How to work it out

Trying values of x in 11x − 11 = 99

Questions

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