Solve 5x − 4 = 36

The solution of 5x − 4 = 36 is x = 8.

5x - 4 = 36\ \Rightarrow\ x = 8

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The lines y = 5x − 4 and y = 36 meet at x = 8. 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.
$5x - 4 = 36$
2
Add 4 to both sides:
$5x - 4 + 4 = 36 + 4 \ \Rightarrow\ 5x = 40$
3
Divide both sides by 5:
$\frac{5x}{5} = \frac{40}{5} \ \Rightarrow\ x = 8$
4
Check: put x = 8 back into the equation.
$5\cdot8 - 4 = 40 - 4 = 36 \checkmark$

LaTeX source of the formulas on this page

\[ 5x - 4 = 36\ \Rightarrow\ x = 8 \]
\[ 5x - 4 = 36 \]
\[ 5x - 4 + 4 = 36 + 4 \ \Rightarrow\ 5x = 40 \]
\[ \frac{5x}{5} = \frac{40}{5} \ \Rightarrow\ x = 8 \]
\[ 5\cdot8 - 4 = 40 - 4 = 36 \checkmark \]

Trying values of x in 5x − 4 = 36

x	5x − 4	Equals 36?
6	26	no
7	31	no
8	36	yes
9	41	no
10	46	no

Questions

What is x in 5x − 4 = 36?

The solution of 5x − 4 = 36 is x = 8.

How do you solve 5x − 4 = 36?

Add 4 to both sides to get 5x = 40, then divide both sides by 5 to get x = 8.

How do I check the answer?

Replace x by 8: 5(8) − 4 = 36, which is 36.

Solve 5x − 4 = 36

How to work it out

Trying values of x in 5x − 4 = 36

Questions

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