Solve 2x + 5 = −15

The solution of 2x + 5 = −15 is x = -10.

2x + 5 = -15\ \Rightarrow\ x = -10

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The lines y = 2x + 5 and y = -15 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 addition, then the multiplication.
$2x + 5 = -15$
2
Subtract 5 from both sides:
$2x + 5 - 5 = -15 - 5 \ \Rightarrow\ 2x = -20$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{-20}{2} \ \Rightarrow\ x = -10$
4
Check: put x = -10 back into the equation.
$2\cdot(-10) + 5 = -20 + 5 = -15 \checkmark$

LaTeX source of the formulas on this page

\[ 2x + 5 = -15\ \Rightarrow\ x = -10 \]
\[ 2x + 5 = -15 \]
\[ 2x + 5 - 5 = -15 - 5 \ \Rightarrow\ 2x = -20 \]
\[ \frac{2x}{2} = \frac{-20}{2} \ \Rightarrow\ x = -10 \]
\[ 2\cdot(-10) + 5 = -20 + 5 = -15 \checkmark \]

Trying values of x in 2x + 5 = −15

x	2x + 5	Equals -15?
-12	-19	no
-11	-17	no
-10	-15	yes
-9	-13	no
-8	-11	no

Questions

What is x in 2x + 5 = −15?

The solution of 2x + 5 = −15 is x = -10.

How do you solve 2x + 5 = −15?

Subtract 5 from both sides to get 2x = -20, then divide both sides by 2 to get x = -10.

How do I check the answer?

Replace x by -10: 2(-10) + 5 = -15, which is -15.

Solve 2x + 5 = −15

How to work it out

Trying values of x in 2x + 5 = −15

Questions

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