Solve 10x − 8 = 82

The solution of 10x − 8 = 82 is x = 9.

10x - 8 = 82\ \Rightarrow\ x = 9

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The lines y = 10x − 8 and y = 82 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.
$10x - 8 = 82$
2
Add 8 to both sides:
$10x - 8 + 8 = 82 + 8 \ \Rightarrow\ 10x = 90$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{90}{10} \ \Rightarrow\ x = 9$
4
Check: put x = 9 back into the equation.
$10\cdot9 - 8 = 90 - 8 = 82 \checkmark$

LaTeX source of the formulas on this page

\[ 10x - 8 = 82\ \Rightarrow\ x = 9 \]
\[ 10x - 8 = 82 \]
\[ 10x - 8 + 8 = 82 + 8 \ \Rightarrow\ 10x = 90 \]
\[ \frac{10x}{10} = \frac{90}{10} \ \Rightarrow\ x = 9 \]
\[ 10\cdot9 - 8 = 90 - 8 = 82 \checkmark \]

Trying values of x in 10x − 8 = 82

x	10x − 8	Equals 82?
7	62	no
8	72	no
9	82	yes
10	92	no
11	102	no

Questions

What is x in 10x − 8 = 82?

The solution of 10x − 8 = 82 is x = 9.

How do you solve 10x − 8 = 82?

Add 8 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) − 8 = 82, which is 82.

Solve 10x − 8 = 82

How to work it out

Trying values of x in 10x − 8 = 82

Questions

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