Solve 2x − 4 = 28

The solution of 2x − 4 = 28 is x = 16.

2x - 4 = 28\ \Rightarrow\ x = 16

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The lines y = 2x − 4 and y = 28 meet at x = 16. 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.
$2x - 4 = 28$
2
Add 4 to both sides:
$2x - 4 + 4 = 28 + 4 \ \Rightarrow\ 2x = 32$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{32}{2} \ \Rightarrow\ x = 16$
4
Check: put x = 16 back into the equation.
$2\cdot16 - 4 = 32 - 4 = 28 \checkmark$

LaTeX source of the formulas on this page

\[ 2x - 4 = 28\ \Rightarrow\ x = 16 \]
\[ 2x - 4 = 28 \]
\[ 2x - 4 + 4 = 28 + 4 \ \Rightarrow\ 2x = 32 \]
\[ \frac{2x}{2} = \frac{32}{2} \ \Rightarrow\ x = 16 \]
\[ 2\cdot16 - 4 = 32 - 4 = 28 \checkmark \]

Trying values of x in 2x − 4 = 28

x	2x − 4	Equals 28?
14	24	no
15	26	no
16	28	yes
17	30	no
18	32	no

Questions

What is x in 2x − 4 = 28?

The solution of 2x − 4 = 28 is x = 16.

How do you solve 2x − 4 = 28?

Add 4 to both sides to get 2x = 32, then divide both sides by 2 to get x = 16.

How do I check the answer?

Replace x by 16: 2(16) − 4 = 28, which is 28.

Solve 2x − 4 = 28

How to work it out

Trying values of x in 2x − 4 = 28

Questions

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