Solve 5x − 4 = −9

The solution of 5x − 4 = −9 is x = -1.

5x - 4 = -9\ \Rightarrow\ x = -1

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The lines y = 5x − 4 and y = -9 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.
$5x - 4 = -9$
2
Add 4 to both sides:
$5x - 4 + 4 = -9 + 4 \ \Rightarrow\ 5x = -5$
3
Divide both sides by 5:
$\frac{5x}{5} = \frac{-5}{5} \ \Rightarrow\ x = -1$
4
Check: put x = -1 back into the equation.
$5\cdot(-1) - 4 = -5 - 4 = -9 \checkmark$

LaTeX source of the formulas on this page

\[ 5x - 4 = -9\ \Rightarrow\ x = -1 \]
\[ 5x - 4 = -9 \]
\[ 5x - 4 + 4 = -9 + 4 \ \Rightarrow\ 5x = -5 \]
\[ \frac{5x}{5} = \frac{-5}{5} \ \Rightarrow\ x = -1 \]
\[ 5\cdot(-1) - 4 = -5 - 4 = -9 \checkmark \]

Trying values of x in 5x − 4 = −9

x	5x − 4	Equals -9?
-3	-19	no
-2	-14	no
-1	-9	yes
0	-4	no
1	1	no

Questions

What is x in 5x − 4 = −9?

The solution of 5x − 4 = −9 is x = -1.

How do you solve 5x − 4 = −9?

Add 4 to both sides to get 5x = -5, then divide both sides by 5 to get x = -1.

How do I check the answer?

Replace x by -1: 5(-1) − 4 = -9, which is -9.

Solve 5x − 4 = −9

How to work it out

Trying values of x in 5x − 4 = −9

Questions

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