Solve 10x − 8 = 102

The solution of 10x − 8 = 102 is x = 11.

10x - 8 = 102\ \Rightarrow\ x = 11

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The lines y = 10x − 8 and y = 102 meet at x = 11. 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.
$10x - 8 = 102$
2
Add 8 to both sides:
$10x - 8 + 8 = 102 + 8 \ \Rightarrow\ 10x = 110$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{110}{10} \ \Rightarrow\ x = 11$
4
Check: put x = 11 back into the equation.
$10\cdot11 - 8 = 110 - 8 = 102 \checkmark$

LaTeX source of the formulas on this page

\[ 10x - 8 = 102\ \Rightarrow\ x = 11 \]
\[ 10x - 8 = 102 \]
\[ 10x - 8 + 8 = 102 + 8 \ \Rightarrow\ 10x = 110 \]
\[ \frac{10x}{10} = \frac{110}{10} \ \Rightarrow\ x = 11 \]
\[ 10\cdot11 - 8 = 110 - 8 = 102 \checkmark \]

Trying values of x in 10x − 8 = 102

x	10x − 8	Equals 102?
9	82	no
10	92	no
11	102	yes
12	112	no
13	122	no

Questions

What is x in 10x − 8 = 102?

The solution of 10x − 8 = 102 is x = 11.

How do you solve 10x − 8 = 102?

Add 8 to both sides to get 10x = 110, then divide both sides by 10 to get x = 11.

How do I check the answer?

Replace x by 11: 10(11) − 8 = 102, which is 102.

Solve 10x − 8 = 102

How to work it out

Trying values of x in 10x − 8 = 102

Questions

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