Solve 5x − 15 = −65

The solution of 5x − 15 = −65 is x = -10.

5x - 15 = -65\ \Rightarrow\ x = -10

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The lines y = 5x − 15 and y = -65 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 subtraction, then the multiplication.
$5x - 15 = -65$
2
Add 15 to both sides:
$5x - 15 + 15 = -65 + 15 \ \Rightarrow\ 5x = -50$
3
Divide both sides by 5:
$\frac{5x}{5} = \frac{-50}{5} \ \Rightarrow\ x = -10$
4
Check: put x = -10 back into the equation.
$5\cdot(-10) - 15 = -50 - 15 = -65 \checkmark$

LaTeX source of the formulas on this page

\[ 5x - 15 = -65\ \Rightarrow\ x = -10 \]
\[ 5x - 15 = -65 \]
\[ 5x - 15 + 15 = -65 + 15 \ \Rightarrow\ 5x = -50 \]
\[ \frac{5x}{5} = \frac{-50}{5} \ \Rightarrow\ x = -10 \]
\[ 5\cdot(-10) - 15 = -50 - 15 = -65 \checkmark \]

Trying values of x in 5x − 15 = −65

x	5x − 15	Equals -65?
-12	-75	no
-11	-70	no
-10	-65	yes
-9	-60	no
-8	-55	no

Questions

What is x in 5x − 15 = −65?

The solution of 5x − 15 = −65 is x = -10.

How do you solve 5x − 15 = −65?

Add 15 to both sides to get 5x = -50, then divide both sides by 5 to get x = -10.

How do I check the answer?

Replace x by -10: 5(-10) − 15 = -65, which is -65.

Solve 5x − 15 = −65

How to work it out

Trying values of x in 5x − 15 = −65

Questions

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