Solve 2x − 4 = 10

The solution of 2x − 4 = 10 is x = 7.

2x - 4 = 10\ \Rightarrow\ x = 7

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The lines y = 2x − 4 and y = 10 meet at x = 7. 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.
$2x - 4 = 10$
2
Add 4 to both sides:
$2x - 4 + 4 = 10 + 4 \ \Rightarrow\ 2x = 14$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{14}{2} \ \Rightarrow\ x = 7$
4
Check: put x = 7 back into the equation.
$2\cdot7 - 4 = 14 - 4 = 10 \checkmark$

LaTeX source of the formulas on this page

\[ 2x - 4 = 10\ \Rightarrow\ x = 7 \]
\[ 2x - 4 = 10 \]
\[ 2x - 4 + 4 = 10 + 4 \ \Rightarrow\ 2x = 14 \]
\[ \frac{2x}{2} = \frac{14}{2} \ \Rightarrow\ x = 7 \]
\[ 2\cdot7 - 4 = 14 - 4 = 10 \checkmark \]

Trying values of x in 2x − 4 = 10

x	2x − 4	Equals 10?
5	6	no
6	8	no
7	10	yes
8	12	no
9	14	no

Questions

What is x in 2x − 4 = 10?

The solution of 2x − 4 = 10 is x = 7.

How do you solve 2x − 4 = 10?

Add 4 to both sides to get 2x = 14, then divide both sides by 2 to get x = 7.

How do I check the answer?

Replace x by 7: 2(7) − 4 = 10, which is 10.

Solve 2x − 4 = 10

How to work it out

Trying values of x in 2x − 4 = 10

Questions

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