Solve 10x − 9 = 151

The solution of 10x − 9 = 151 is x = 16.

10x - 9 = 151\ \Rightarrow\ x = 16

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The lines y = 10x − 9 and y = 151 meet at x = 16. 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.
$10x - 9 = 151$
2
Add 9 to both sides:
$10x - 9 + 9 = 151 + 9 \ \Rightarrow\ 10x = 160$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{160}{10} \ \Rightarrow\ x = 16$
4
Check: put x = 16 back into the equation.
$10\cdot16 - 9 = 160 - 9 = 151 \checkmark$

LaTeX source of the formulas on this page

\[ 10x - 9 = 151\ \Rightarrow\ x = 16 \]
\[ 10x - 9 = 151 \]
\[ 10x - 9 + 9 = 151 + 9 \ \Rightarrow\ 10x = 160 \]
\[ \frac{10x}{10} = \frac{160}{10} \ \Rightarrow\ x = 16 \]
\[ 10\cdot16 - 9 = 160 - 9 = 151 \checkmark \]

Trying values of x in 10x − 9 = 151

x	10x − 9	Equals 151?
14	131	no
15	141	no
16	151	yes
17	161	no
18	171	no

Questions

What is x in 10x − 9 = 151?

The solution of 10x − 9 = 151 is x = 16.

How do you solve 10x − 9 = 151?

Add 9 to both sides to get 10x = 160, then divide both sides by 10 to get x = 16.

How do I check the answer?

Replace x by 16: 10(16) − 9 = 151, which is 151.

Solve 10x − 9 = 151

How to work it out

Trying values of x in 10x − 9 = 151

Questions

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