Solve 2x − 8 = 30

The solution of 2x − 8 = 30 is x = 19.

2x - 8 = 30\ \Rightarrow\ x = 19

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The lines y = 2x − 8 and y = 30 meet at x = 19. 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.
$2x - 8 = 30$
2
Add 8 to both sides:
$2x - 8 + 8 = 30 + 8 \ \Rightarrow\ 2x = 38$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{38}{2} \ \Rightarrow\ x = 19$
4
Check: put x = 19 back into the equation.
$2\cdot19 - 8 = 38 - 8 = 30 \checkmark$

LaTeX source of the formulas on this page

\[ 2x - 8 = 30\ \Rightarrow\ x = 19 \]
\[ 2x - 8 = 30 \]
\[ 2x - 8 + 8 = 30 + 8 \ \Rightarrow\ 2x = 38 \]
\[ \frac{2x}{2} = \frac{38}{2} \ \Rightarrow\ x = 19 \]
\[ 2\cdot19 - 8 = 38 - 8 = 30 \checkmark \]

Trying values of x in 2x − 8 = 30

x	2x − 8	Equals 30?
17	26	no
18	28	no
19	30	yes
20	32	no
21	34	no

Questions

What is x in 2x − 8 = 30?

The solution of 2x − 8 = 30 is x = 19.

How do you solve 2x − 8 = 30?

Add 8 to both sides to get 2x = 38, then divide both sides by 2 to get x = 19.

How do I check the answer?

Replace x by 19: 2(19) − 8 = 30, which is 30.

Solve 2x − 8 = 30

How to work it out

Trying values of x in 2x − 8 = 30

Questions

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