Solve 9x + 4 = 22

The solution of 9x + 4 = 22 is x = 2.

9x + 4 = 22\ \Rightarrow\ x = 2

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The lines y = 9x + 4 and y = 22 meet at x = 2. 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 addition, then the multiplication.
$9x + 4 = 22$
2
Subtract 4 from both sides:
$9x + 4 - 4 = 22 - 4 \ \Rightarrow\ 9x = 18$
3
Divide both sides by 9:
$\frac{9x}{9} = \frac{18}{9} \ \Rightarrow\ x = 2$
4
Check: put x = 2 back into the equation.
$9\cdot2 + 4 = 18 + 4 = 22 \checkmark$

LaTeX source of the formulas on this page

\[ 9x + 4 = 22\ \Rightarrow\ x = 2 \]
\[ 9x + 4 = 22 \]
\[ 9x + 4 - 4 = 22 - 4 \ \Rightarrow\ 9x = 18 \]
\[ \frac{9x}{9} = \frac{18}{9} \ \Rightarrow\ x = 2 \]
\[ 9\cdot2 + 4 = 18 + 4 = 22 \checkmark \]

Trying values of x in 9x + 4 = 22

x	9x + 4	Equals 22?
0	4	no
1	13	no
2	22	yes
3	31	no
4	40	no

Questions

What is x in 9x + 4 = 22?

The solution of 9x + 4 = 22 is x = 2.

How do you solve 9x + 4 = 22?

Subtract 4 from both sides to get 9x = 18, then divide both sides by 9 to get x = 2.

How do I check the answer?

Replace x by 2: 9(2) + 4 = 22, which is 22.

Solve 9x + 4 = 22

How to work it out

Trying values of x in 9x + 4 = 22

Questions

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