Solve 11x − 15 = 139

The solution of 11x − 15 = 139 is x = 14.

11x - 15 = 139\ \Rightarrow\ x = 14

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The lines y = 11x − 15 and y = 139 meet at x = 14. 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.
$11x - 15 = 139$
2
Add 15 to both sides:
$11x - 15 + 15 = 139 + 15 \ \Rightarrow\ 11x = 154$
3
Divide both sides by 11:
$\frac{11x}{11} = \frac{154}{11} \ \Rightarrow\ x = 14$
4
Check: put x = 14 back into the equation.
$11\cdot14 - 15 = 154 - 15 = 139 \checkmark$

LaTeX source of the formulas on this page

\[ 11x - 15 = 139\ \Rightarrow\ x = 14 \]
\[ 11x - 15 = 139 \]
\[ 11x - 15 + 15 = 139 + 15 \ \Rightarrow\ 11x = 154 \]
\[ \frac{11x}{11} = \frac{154}{11} \ \Rightarrow\ x = 14 \]
\[ 11\cdot14 - 15 = 154 - 15 = 139 \checkmark \]

Trying values of x in 11x − 15 = 139

x	11x − 15	Equals 139?
12	117	no
13	128	no
14	139	yes
15	150	no
16	161	no

Questions

What is x in 11x − 15 = 139?

The solution of 11x − 15 = 139 is x = 14.

How do you solve 11x − 15 = 139?

Add 15 to both sides to get 11x = 154, then divide both sides by 11 to get x = 14.

How do I check the answer?

Replace x by 14: 11(14) − 15 = 139, which is 139.

Solve 11x − 15 = 139

How to work it out

Trying values of x in 11x − 15 = 139

Questions

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