Solve 4x − 9 = −33

The solution of 4x − 9 = −33 is x = -6.

4x - 9 = -33\ \Rightarrow\ x = -6

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The lines y = 4x − 9 and y = -33 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.
$4x - 9 = -33$
2
Add 9 to both sides:
$4x - 9 + 9 = -33 + 9 \ \Rightarrow\ 4x = -24$
3
Divide both sides by 4:
$\frac{4x}{4} = \frac{-24}{4} \ \Rightarrow\ x = -6$
4
Check: put x = -6 back into the equation.
$4\cdot(-6) - 9 = -24 - 9 = -33 \checkmark$

LaTeX source of the formulas on this page

\[ 4x - 9 = -33\ \Rightarrow\ x = -6 \]
\[ 4x - 9 = -33 \]
\[ 4x - 9 + 9 = -33 + 9 \ \Rightarrow\ 4x = -24 \]
\[ \frac{4x}{4} = \frac{-24}{4} \ \Rightarrow\ x = -6 \]
\[ 4\cdot(-6) - 9 = -24 - 9 = -33 \checkmark \]

Trying values of x in 4x − 9 = −33

x	4x − 9	Equals -33?
-8	-41	no
-7	-37	no
-6	-33	yes
-5	-29	no
-4	-25	no

Questions

What is x in 4x − 9 = −33?

The solution of 4x − 9 = −33 is x = -6.

How do you solve 4x − 9 = −33?

Add 9 to both sides to get 4x = -24, then divide both sides by 4 to get x = -6.

How do I check the answer?

Replace x by -6: 4(-6) − 9 = -33, which is -33.

Solve 4x − 9 = −33

How to work it out

Trying values of x in 4x − 9 = −33

Questions

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