Solve 12x − 13 = −109

The solution of 12x − 13 = −109 is x = -8.

12x - 13 = -109\ \Rightarrow\ x = -8

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The lines y = 12x − 13 and y = -109 meet at x = -8. 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.
$12x - 13 = -109$
2
Add 13 to both sides:
$12x - 13 + 13 = -109 + 13 \ \Rightarrow\ 12x = -96$
3
Divide both sides by 12:
$\frac{12x}{12} = \frac{-96}{12} \ \Rightarrow\ x = -8$
4
Check: put x = -8 back into the equation.
$12\cdot(-8) - 13 = -96 - 13 = -109 \checkmark$

LaTeX source of the formulas on this page

\[ 12x - 13 = -109\ \Rightarrow\ x = -8 \]
\[ 12x - 13 = -109 \]
\[ 12x - 13 + 13 = -109 + 13 \ \Rightarrow\ 12x = -96 \]
\[ \frac{12x}{12} = \frac{-96}{12} \ \Rightarrow\ x = -8 \]
\[ 12\cdot(-8) - 13 = -96 - 13 = -109 \checkmark \]

Trying values of x in 12x − 13 = −109

x	12x − 13	Equals -109?
-10	-133	no
-9	-121	no
-8	-109	yes
-7	-97	no
-6	-85	no

Questions

What is x in 12x − 13 = −109?

The solution of 12x − 13 = −109 is x = -8.

How do you solve 12x − 13 = −109?

Add 13 to both sides to get 12x = -96, then divide both sides by 12 to get x = -8.

How do I check the answer?

Replace x by -8: 12(-8) − 13 = -109, which is -109.

Solve 12x − 13 = −109

How to work it out

Trying values of x in 12x − 13 = −109

Questions

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