Solve 2x − 4 = 8

The solution of 2x − 4 = 8 is x = 6.

2x - 4 = 8\ \Rightarrow\ x = 6

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The lines y = 2x − 4 and y = 8 meet at x = 6. 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.
$2x - 4 = 8$
2
Add 4 to both sides:
$2x - 4 + 4 = 8 + 4 \ \Rightarrow\ 2x = 12$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{12}{2} \ \Rightarrow\ x = 6$
4
Check: put x = 6 back into the equation.
$2\cdot6 - 4 = 12 - 4 = 8 \checkmark$

LaTeX source of the formulas on this page

\[ 2x - 4 = 8\ \Rightarrow\ x = 6 \]
\[ 2x - 4 = 8 \]
\[ 2x - 4 + 4 = 8 + 4 \ \Rightarrow\ 2x = 12 \]
\[ \frac{2x}{2} = \frac{12}{2} \ \Rightarrow\ x = 6 \]
\[ 2\cdot6 - 4 = 12 - 4 = 8 \checkmark \]

Trying values of x in 2x − 4 = 8

x	2x − 4	Equals 8?
4	4	no
5	6	no
6	8	yes
7	10	no
8	12	no

Questions

What is x in 2x − 4 = 8?

The solution of 2x − 4 = 8 is x = 6.

How do you solve 2x − 4 = 8?

Add 4 to both sides to get 2x = 12, then divide both sides by 2 to get x = 6.

How do I check the answer?

Replace x by 6: 2(6) − 4 = 8, which is 8.

Solve 2x − 4 = 8

How to work it out

Trying values of x in 2x − 4 = 8

Questions

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