Solve 2x − 4 = 14

The solution of 2x − 4 = 14 is x = 9.

2x - 4 = 14\ \Rightarrow\ x = 9

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The lines y = 2x − 4 and y = 14 meet at x = 9. 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.
$2x - 4 = 14$
2
Add 4 to both sides:
$2x - 4 + 4 = 14 + 4 \ \Rightarrow\ 2x = 18$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{18}{2} \ \Rightarrow\ x = 9$
4
Check: put x = 9 back into the equation.
$2\cdot9 - 4 = 18 - 4 = 14 \checkmark$

LaTeX source of the formulas on this page

\[ 2x - 4 = 14\ \Rightarrow\ x = 9 \]
\[ 2x - 4 = 14 \]
\[ 2x - 4 + 4 = 14 + 4 \ \Rightarrow\ 2x = 18 \]
\[ \frac{2x}{2} = \frac{18}{2} \ \Rightarrow\ x = 9 \]
\[ 2\cdot9 - 4 = 18 - 4 = 14 \checkmark \]

Trying values of x in 2x − 4 = 14

x	2x − 4	Equals 14?
7	10	no
8	12	no
9	14	yes
10	16	no
11	18	no

Questions

What is x in 2x − 4 = 14?

The solution of 2x − 4 = 14 is x = 9.

How do you solve 2x − 4 = 14?

Add 4 to both sides to get 2x = 18, then divide both sides by 2 to get x = 9.

How do I check the answer?

Replace x by 9: 2(9) − 4 = 14, which is 14.

Solve 2x − 4 = 14

How to work it out

Trying values of x in 2x − 4 = 14

Questions

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