Solve 11x − 9 = −20

The solution of 11x − 9 = −20 is x = -1.

11x - 9 = -20\ \Rightarrow\ x = -1

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The lines y = 11x − 9 and y = -20 meet at x = -1. 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.
$11x - 9 = -20$
2
Add 9 to both sides:
$11x - 9 + 9 = -20 + 9 \ \Rightarrow\ 11x = -11$
3
Divide both sides by 11:
$\frac{11x}{11} = \frac{-11}{11} \ \Rightarrow\ x = -1$
4
Check: put x = -1 back into the equation.
$11\cdot(-1) - 9 = -11 - 9 = -20 \checkmark$

LaTeX source of the formulas on this page

\[ 11x - 9 = -20\ \Rightarrow\ x = -1 \]
\[ 11x - 9 = -20 \]
\[ 11x - 9 + 9 = -20 + 9 \ \Rightarrow\ 11x = -11 \]
\[ \frac{11x}{11} = \frac{-11}{11} \ \Rightarrow\ x = -1 \]
\[ 11\cdot(-1) - 9 = -11 - 9 = -20 \checkmark \]

Trying values of x in 11x − 9 = −20

x	11x − 9	Equals -20?
-3	-42	no
-2	-31	no
-1	-20	yes
0	-9	no
1	2	no

Questions

What is x in 11x − 9 = −20?

The solution of 11x − 9 = −20 is x = -1.

How do you solve 11x − 9 = −20?

Add 9 to both sides to get 11x = -11, then divide both sides by 11 to get x = -1.

How do I check the answer?

Replace x by -1: 11(-1) − 9 = -20, which is -20.

Solve 11x − 9 = −20

How to work it out

Trying values of x in 11x − 9 = −20

Questions

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