Solve 5x + 2 = −8

The solution of 5x + 2 = −8 is x = -2.

5x + 2 = -8\ \Rightarrow\ x = -2

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The lines y = 5x + 2 and y = -8 meet at x = -2. 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.
$5x + 2 = -8$
2
Subtract 2 from both sides:
$5x + 2 - 2 = -8 - 2 \ \Rightarrow\ 5x = -10$
3
Divide both sides by 5:
$\frac{5x}{5} = \frac{-10}{5} \ \Rightarrow\ x = -2$
4
Check: put x = -2 back into the equation.
$5\cdot(-2) + 2 = -10 + 2 = -8 \checkmark$

LaTeX source of the formulas on this page

\[ 5x + 2 = -8\ \Rightarrow\ x = -2 \]
\[ 5x + 2 = -8 \]
\[ 5x + 2 - 2 = -8 - 2 \ \Rightarrow\ 5x = -10 \]
\[ \frac{5x}{5} = \frac{-10}{5} \ \Rightarrow\ x = -2 \]
\[ 5\cdot(-2) + 2 = -10 + 2 = -8 \checkmark \]

Trying values of x in 5x + 2 = −8

x	5x + 2	Equals -8?
-4	-18	no
-3	-13	no
-2	-8	yes
-1	-3	no
0	2	no

Questions

What is x in 5x + 2 = −8?

The solution of 5x + 2 = −8 is x = -2.

How do you solve 5x + 2 = −8?

Subtract 2 from both sides to get 5x = -10, then divide both sides by 5 to get x = -2.

How do I check the answer?

Replace x by -2: 5(-2) + 2 = -8, which is -8.

Solve 5x + 2 = −8

How to work it out

Trying values of x in 5x + 2 = −8

Questions

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