Solve 11x − 4 = 139

The solution of 11x − 4 = 139 is x = 13.

11x - 4 = 139\ \Rightarrow\ x = 13

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The lines y = 11x − 4 and y = 139 meet at x = 13. 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.
$11x - 4 = 139$
2
Add 4 to both sides:
$11x - 4 + 4 = 139 + 4 \ \Rightarrow\ 11x = 143$
3
Divide both sides by 11:
$\frac{11x}{11} = \frac{143}{11} \ \Rightarrow\ x = 13$
4
Check: put x = 13 back into the equation.
$11\cdot13 - 4 = 143 - 4 = 139 \checkmark$

LaTeX source of the formulas on this page

\[ 11x - 4 = 139\ \Rightarrow\ x = 13 \]
\[ 11x - 4 = 139 \]
\[ 11x - 4 + 4 = 139 + 4 \ \Rightarrow\ 11x = 143 \]
\[ \frac{11x}{11} = \frac{143}{11} \ \Rightarrow\ x = 13 \]
\[ 11\cdot13 - 4 = 143 - 4 = 139 \checkmark \]

Trying values of x in 11x − 4 = 139

x	11x − 4	Equals 139?
11	117	no
12	128	no
13	139	yes
14	150	no
15	161	no

Questions

What is x in 11x − 4 = 139?

The solution of 11x − 4 = 139 is x = 13.

How do you solve 11x − 4 = 139?

Add 4 to both sides to get 11x = 143, then divide both sides by 11 to get x = 13.

How do I check the answer?

Replace x by 13: 11(13) − 4 = 139, which is 139.

Solve 11x − 4 = 139

How to work it out

Trying values of x in 11x − 4 = 139

Questions

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