Solve 9x − 5 = 139

The solution of 9x − 5 = 139 is x = 16.

9x - 5 = 139\ \Rightarrow\ x = 16

Explain it step by step in chat Make a short video of it

The lines y = 9x − 5 and y = 139 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.
$9x - 5 = 139$
2
Add 5 to both sides:
$9x - 5 + 5 = 139 + 5 \ \Rightarrow\ 9x = 144$
3
Divide both sides by 9:
$\frac{9x}{9} = \frac{144}{9} \ \Rightarrow\ x = 16$
4
Check: put x = 16 back into the equation.
$9\cdot16 - 5 = 144 - 5 = 139 \checkmark$

LaTeX source of the formulas on this page

\[ 9x - 5 = 139\ \Rightarrow\ x = 16 \]
\[ 9x - 5 = 139 \]
\[ 9x - 5 + 5 = 139 + 5 \ \Rightarrow\ 9x = 144 \]
\[ \frac{9x}{9} = \frac{144}{9} \ \Rightarrow\ x = 16 \]
\[ 9\cdot16 - 5 = 144 - 5 = 139 \checkmark \]

Trying values of x in 9x − 5 = 139

x	9x − 5	Equals 139?
14	121	no
15	130	no
16	139	yes
17	148	no
18	157	no

Questions

What is x in 9x − 5 = 139?

The solution of 9x − 5 = 139 is x = 16.

How do you solve 9x − 5 = 139?

Add 5 to both sides to get 9x = 144, then divide both sides by 9 to get x = 16.

How do I check the answer?

Replace x by 16: 9(16) − 5 = 139, which is 139.

Solve 9x − 5 = 139

How to work it out

Trying values of x in 9x − 5 = 139

Questions

Similar equations