Solve 12x − 4 = −124

The solution of 12x − 4 = −124 is x = -10.

12x - 4 = -124\ \Rightarrow\ x = -10

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The lines y = 12x − 4 and y = -124 meet at x = -10. 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.
$12x - 4 = -124$
2
Add 4 to both sides:
$12x - 4 + 4 = -124 + 4 \ \Rightarrow\ 12x = -120$
3
Divide both sides by 12:
$\frac{12x}{12} = \frac{-120}{12} \ \Rightarrow\ x = -10$
4
Check: put x = -10 back into the equation.
$12\cdot(-10) - 4 = -120 - 4 = -124 \checkmark$

LaTeX source of the formulas on this page

\[ 12x - 4 = -124\ \Rightarrow\ x = -10 \]
\[ 12x - 4 = -124 \]
\[ 12x - 4 + 4 = -124 + 4 \ \Rightarrow\ 12x = -120 \]
\[ \frac{12x}{12} = \frac{-120}{12} \ \Rightarrow\ x = -10 \]
\[ 12\cdot(-10) - 4 = -120 - 4 = -124 \checkmark \]

Trying values of x in 12x − 4 = −124

x	12x − 4	Equals -124?
-12	-148	no
-11	-136	no
-10	-124	yes
-9	-112	no
-8	-100	no

Questions

What is x in 12x − 4 = −124?

The solution of 12x − 4 = −124 is x = -10.

How do you solve 12x − 4 = −124?

Add 4 to both sides to get 12x = -120, then divide both sides by 12 to get x = -10.

How do I check the answer?

Replace x by -10: 12(-10) − 4 = -124, which is -124.

Solve 12x − 4 = −124

How to work it out

Trying values of x in 12x − 4 = −124

Questions

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