Solve 10x − 9 = 11

The solution of 10x − 9 = 11 is x = 2.

10x - 9 = 11\ \Rightarrow\ x = 2

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The lines y = 10x − 9 and y = 11 meet at x = 2. 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.
$10x - 9 = 11$
2
Add 9 to both sides:
$10x - 9 + 9 = 11 + 9 \ \Rightarrow\ 10x = 20$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{20}{10} \ \Rightarrow\ x = 2$
4
Check: put x = 2 back into the equation.
$10\cdot2 - 9 = 20 - 9 = 11 \checkmark$

LaTeX source of the formulas on this page

\[ 10x - 9 = 11\ \Rightarrow\ x = 2 \]
\[ 10x - 9 = 11 \]
\[ 10x - 9 + 9 = 11 + 9 \ \Rightarrow\ 10x = 20 \]
\[ \frac{10x}{10} = \frac{20}{10} \ \Rightarrow\ x = 2 \]
\[ 10\cdot2 - 9 = 20 - 9 = 11 \checkmark \]

Trying values of x in 10x − 9 = 11

x	10x − 9	Equals 11?
0	-9	no
1	1	no
2	11	yes
3	21	no
4	31	no

Questions

What is x in 10x − 9 = 11?

The solution of 10x − 9 = 11 is x = 2.

How do you solve 10x − 9 = 11?

Add 9 to both sides to get 10x = 20, then divide both sides by 10 to get x = 2.

How do I check the answer?

Replace x by 2: 10(2) − 9 = 11, which is 11.

Solve 10x − 9 = 11

How to work it out

Trying values of x in 10x − 9 = 11

Questions

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