Solve 9x − 9 = −63

The solution of 9x − 9 = −63 is x = -6.

9x - 9 = -63\ \Rightarrow\ x = -6

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The lines y = 9x − 9 and y = -63 meet at x = -6. 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.
$9x - 9 = -63$
2
Add 9 to both sides:
$9x - 9 + 9 = -63 + 9 \ \Rightarrow\ 9x = -54$
3
Divide both sides by 9:
$\frac{9x}{9} = \frac{-54}{9} \ \Rightarrow\ x = -6$
4
Check: put x = -6 back into the equation.
$9\cdot(-6) - 9 = -54 - 9 = -63 \checkmark$

LaTeX source of the formulas on this page

\[ 9x - 9 = -63\ \Rightarrow\ x = -6 \]
\[ 9x - 9 = -63 \]
\[ 9x - 9 + 9 = -63 + 9 \ \Rightarrow\ 9x = -54 \]
\[ \frac{9x}{9} = \frac{-54}{9} \ \Rightarrow\ x = -6 \]
\[ 9\cdot(-6) - 9 = -54 - 9 = -63 \checkmark \]

Trying values of x in 9x − 9 = −63

x	9x − 9	Equals -63?
-8	-81	no
-7	-72	no
-6	-63	yes
-5	-54	no
-4	-45	no

Questions

What is x in 9x − 9 = −63?

The solution of 9x − 9 = −63 is x = -6.

How do you solve 9x − 9 = −63?

Add 9 to both sides to get 9x = -54, then divide both sides by 9 to get x = -6.

How do I check the answer?

Replace x by -6: 9(-6) − 9 = -63, which is -63.

Solve 9x − 9 = −63

How to work it out

Trying values of x in 9x − 9 = −63

Questions

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