Solve 8x + 2 = −30

The solution of 8x + 2 = −30 is x = -4.

8x + 2 = -30\ \Rightarrow\ x = -4

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The lines y = 8x + 2 and y = -30 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 addition, then the multiplication.
$8x + 2 = -30$
2
Subtract 2 from both sides:
$8x + 2 - 2 = -30 - 2 \ \Rightarrow\ 8x = -32$
3
Divide both sides by 8:
$\frac{8x}{8} = \frac{-32}{8} \ \Rightarrow\ x = -4$
4
Check: put x = -4 back into the equation.
$8\cdot(-4) + 2 = -32 + 2 = -30 \checkmark$

LaTeX source of the formulas on this page

\[ 8x + 2 = -30\ \Rightarrow\ x = -4 \]
\[ 8x + 2 = -30 \]
\[ 8x + 2 - 2 = -30 - 2 \ \Rightarrow\ 8x = -32 \]
\[ \frac{8x}{8} = \frac{-32}{8} \ \Rightarrow\ x = -4 \]
\[ 8\cdot(-4) + 2 = -32 + 2 = -30 \checkmark \]

Trying values of x in 8x + 2 = −30

x	8x + 2	Equals -30?
-6	-46	no
-5	-38	no
-4	-30	yes
-3	-22	no
-2	-14	no

Questions

What is x in 8x + 2 = −30?

The solution of 8x + 2 = −30 is x = -4.

How do you solve 8x + 2 = −30?

Subtract 2 from both sides to get 8x = -32, then divide both sides by 8 to get x = -4.

How do I check the answer?

Replace x by -4: 8(-4) + 2 = -30, which is -30.

Solve 8x + 2 = −30

How to work it out

Trying values of x in 8x + 2 = −30

Questions

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