Solve 10x − 8 = 172

The solution of 10x − 8 = 172 is x = 18.

10x - 8 = 172\ \Rightarrow\ x = 18

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The lines y = 10x − 8 and y = 172 meet at x = 18. 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.
$10x - 8 = 172$
2
Add 8 to both sides:
$10x - 8 + 8 = 172 + 8 \ \Rightarrow\ 10x = 180$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{180}{10} \ \Rightarrow\ x = 18$
4
Check: put x = 18 back into the equation.
$10\cdot18 - 8 = 180 - 8 = 172 \checkmark$

LaTeX source of the formulas on this page

\[ 10x - 8 = 172\ \Rightarrow\ x = 18 \]
\[ 10x - 8 = 172 \]
\[ 10x - 8 + 8 = 172 + 8 \ \Rightarrow\ 10x = 180 \]
\[ \frac{10x}{10} = \frac{180}{10} \ \Rightarrow\ x = 18 \]
\[ 10\cdot18 - 8 = 180 - 8 = 172 \checkmark \]

Trying values of x in 10x − 8 = 172

x	10x − 8	Equals 172?
16	152	no
17	162	no
18	172	yes
19	182	no
20	192	no

Questions

What is x in 10x − 8 = 172?

The solution of 10x − 8 = 172 is x = 18.

How do you solve 10x − 8 = 172?

Add 8 to both sides to get 10x = 180, then divide both sides by 10 to get x = 18.

How do I check the answer?

Replace x by 18: 10(18) − 8 = 172, which is 172.

Solve 10x − 8 = 172

How to work it out

Trying values of x in 10x − 8 = 172

Questions

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