Solve 5x − 15 = −60

The solution of 5x − 15 = −60 is x = -9.

5x - 15 = -60\ \Rightarrow\ x = -9

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The lines y = 5x − 15 and y = -60 meet at x = -9. 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.
$5x - 15 = -60$
2
Add 15 to both sides:
$5x - 15 + 15 = -60 + 15 \ \Rightarrow\ 5x = -45$
3
Divide both sides by 5:
$\frac{5x}{5} = \frac{-45}{5} \ \Rightarrow\ x = -9$
4
Check: put x = -9 back into the equation.
$5\cdot(-9) - 15 = -45 - 15 = -60 \checkmark$

LaTeX source of the formulas on this page

\[ 5x - 15 = -60\ \Rightarrow\ x = -9 \]
\[ 5x - 15 = -60 \]
\[ 5x - 15 + 15 = -60 + 15 \ \Rightarrow\ 5x = -45 \]
\[ \frac{5x}{5} = \frac{-45}{5} \ \Rightarrow\ x = -9 \]
\[ 5\cdot(-9) - 15 = -45 - 15 = -60 \checkmark \]

Trying values of x in 5x − 15 = −60

x	5x − 15	Equals -60?
-11	-70	no
-10	-65	no
-9	-60	yes
-8	-55	no
-7	-50	no

Questions

What is x in 5x − 15 = −60?

The solution of 5x − 15 = −60 is x = -9.

How do you solve 5x − 15 = −60?

Add 15 to both sides to get 5x = -45, then divide both sides by 5 to get x = -9.

How do I check the answer?

Replace x by -9: 5(-9) − 15 = -60, which is -60.

Solve 5x − 15 = −60

How to work it out

Trying values of x in 5x − 15 = −60

Questions

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