Solve 9x + 4 = −50

The solution of 9x + 4 = −50 is x = -6.

9x + 4 = -50\ \Rightarrow\ x = -6

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The lines y = 9x + 4 and y = -50 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 addition, then the multiplication.
$9x + 4 = -50$
2
Subtract 4 from both sides:
$9x + 4 - 4 = -50 - 4 \ \Rightarrow\ 9x = -54$
3
Divide both sides by 9:
$\frac{9x}{9} = \frac{-54}{9} \ \Rightarrow\ x = -6$
4
Check: put x = -6 back into the equation.
$9\cdot(-6) + 4 = -54 + 4 = -50 \checkmark$

LaTeX source of the formulas on this page

\[ 9x + 4 = -50\ \Rightarrow\ x = -6 \]
\[ 9x + 4 = -50 \]
\[ 9x + 4 - 4 = -50 - 4 \ \Rightarrow\ 9x = -54 \]
\[ \frac{9x}{9} = \frac{-54}{9} \ \Rightarrow\ x = -6 \]
\[ 9\cdot(-6) + 4 = -54 + 4 = -50 \checkmark \]

Trying values of x in 9x + 4 = −50

x	9x + 4	Equals -50?
-8	-68	no
-7	-59	no
-6	-50	yes
-5	-41	no
-4	-32	no

Questions

What is x in 9x + 4 = −50?

The solution of 9x + 4 = −50 is x = -6.

How do you solve 9x + 4 = −50?

Subtract 4 from both sides to get 9x = -54, then divide both sides by 9 to get x = -6.

How do I check the answer?

Replace x by -6: 9(-6) + 4 = -50, which is -50.

Solve 9x + 4 = −50

How to work it out

Trying values of x in 9x + 4 = −50

Questions

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