Solve 10x − 12 = 28

The solution of 10x − 12 = 28 is x = 4.

10x - 12 = 28\ \Rightarrow\ x = 4

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The lines y = 10x − 12 and y = 28 meet at x = 4. 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.
$10x - 12 = 28$
2
Add 12 to both sides:
$10x - 12 + 12 = 28 + 12 \ \Rightarrow\ 10x = 40$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{40}{10} \ \Rightarrow\ x = 4$
4
Check: put x = 4 back into the equation.
$10\cdot4 - 12 = 40 - 12 = 28 \checkmark$

LaTeX source of the formulas on this page

\[ 10x - 12 = 28\ \Rightarrow\ x = 4 \]
\[ 10x - 12 = 28 \]
\[ 10x - 12 + 12 = 28 + 12 \ \Rightarrow\ 10x = 40 \]
\[ \frac{10x}{10} = \frac{40}{10} \ \Rightarrow\ x = 4 \]
\[ 10\cdot4 - 12 = 40 - 12 = 28 \checkmark \]

Trying values of x in 10x − 12 = 28

x	10x − 12	Equals 28?
2	8	no
3	18	no
4	28	yes
5	38	no
6	48	no

Questions

What is x in 10x − 12 = 28?

The solution of 10x − 12 = 28 is x = 4.

How do you solve 10x − 12 = 28?

Add 12 to both sides to get 10x = 40, then divide both sides by 10 to get x = 4.

How do I check the answer?

Replace x by 4: 10(4) − 12 = 28, which is 28.

Solve 10x − 12 = 28

How to work it out

Trying values of x in 10x − 12 = 28

Questions

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