Solve 10x − 15 = 145

The solution of 10x − 15 = 145 is x = 16.

10x - 15 = 145\ \Rightarrow\ x = 16

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The lines y = 10x − 15 and y = 145 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.
$10x - 15 = 145$
2
Add 15 to both sides:
$10x - 15 + 15 = 145 + 15 \ \Rightarrow\ 10x = 160$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{160}{10} \ \Rightarrow\ x = 16$
4
Check: put x = 16 back into the equation.
$10\cdot16 - 15 = 160 - 15 = 145 \checkmark$

LaTeX source of the formulas on this page

\[ 10x - 15 = 145\ \Rightarrow\ x = 16 \]
\[ 10x - 15 = 145 \]
\[ 10x - 15 + 15 = 145 + 15 \ \Rightarrow\ 10x = 160 \]
\[ \frac{10x}{10} = \frac{160}{10} \ \Rightarrow\ x = 16 \]
\[ 10\cdot16 - 15 = 160 - 15 = 145 \checkmark \]

Trying values of x in 10x − 15 = 145

x	10x − 15	Equals 145?
14	125	no
15	135	no
16	145	yes
17	155	no
18	165	no

Questions

What is x in 10x − 15 = 145?

The solution of 10x − 15 = 145 is x = 16.

How do you solve 10x − 15 = 145?

Add 15 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) − 15 = 145, which is 145.

Solve 10x − 15 = 145

How to work it out

Trying values of x in 10x − 15 = 145

Questions

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