Solve 12x + 6 = −90

The solution of 12x + 6 = −90 is x = -8.

12x + 6 = -90\ \Rightarrow\ x = -8

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The lines y = 12x + 6 and y = -90 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 addition, then the multiplication.
$12x + 6 = -90$
2
Subtract 6 from both sides:
$12x + 6 - 6 = -90 - 6 \ \Rightarrow\ 12x = -96$
3
Divide both sides by 12:
$\frac{12x}{12} = \frac{-96}{12} \ \Rightarrow\ x = -8$
4
Check: put x = -8 back into the equation.
$12\cdot(-8) + 6 = -96 + 6 = -90 \checkmark$

LaTeX source of the formulas on this page

\[ 12x + 6 = -90\ \Rightarrow\ x = -8 \]
\[ 12x + 6 = -90 \]
\[ 12x + 6 - 6 = -90 - 6 \ \Rightarrow\ 12x = -96 \]
\[ \frac{12x}{12} = \frac{-96}{12} \ \Rightarrow\ x = -8 \]
\[ 12\cdot(-8) + 6 = -96 + 6 = -90 \checkmark \]

Trying values of x in 12x + 6 = −90

x	12x + 6	Equals -90?
-10	-114	no
-9	-102	no
-8	-90	yes
-7	-78	no
-6	-66	no

Questions

What is x in 12x + 6 = −90?

The solution of 12x + 6 = −90 is x = -8.

How do you solve 12x + 6 = −90?

Subtract 6 from 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) + 6 = -90, which is -90.

Solve 12x + 6 = −90

How to work it out

Trying values of x in 12x + 6 = −90

Questions

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