Solve 9x − 5 = −86

The solution of 9x − 5 = −86 is x = -9.

9x - 5 = -86\ \Rightarrow\ x = -9

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The lines y = 9x − 5 and y = -86 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.
$9x - 5 = -86$
2
Add 5 to both sides:
$9x - 5 + 5 = -86 + 5 \ \Rightarrow\ 9x = -81$
3
Divide both sides by 9:
$\frac{9x}{9} = \frac{-81}{9} \ \Rightarrow\ x = -9$
4
Check: put x = -9 back into the equation.
$9\cdot(-9) - 5 = -81 - 5 = -86 \checkmark$

LaTeX source of the formulas on this page

\[ 9x - 5 = -86\ \Rightarrow\ x = -9 \]
\[ 9x - 5 = -86 \]
\[ 9x - 5 + 5 = -86 + 5 \ \Rightarrow\ 9x = -81 \]
\[ \frac{9x}{9} = \frac{-81}{9} \ \Rightarrow\ x = -9 \]
\[ 9\cdot(-9) - 5 = -81 - 5 = -86 \checkmark \]

Trying values of x in 9x − 5 = −86

x	9x − 5	Equals -86?
-11	-104	no
-10	-95	no
-9	-86	yes
-8	-77	no
-7	-68	no

Questions

What is x in 9x − 5 = −86?

The solution of 9x − 5 = −86 is x = -9.

How do you solve 9x − 5 = −86?

Add 5 to both sides to get 9x = -81, then divide both sides by 9 to get x = -9.

How do I check the answer?

Replace x by -9: 9(-9) − 5 = -86, which is -86.

Solve 9x − 5 = −86

How to work it out

Trying values of x in 9x − 5 = −86

Questions

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