Solve 6x + 9 = −51

The solution of 6x + 9 = −51 is x = -10.

6x + 9 = -51\ \Rightarrow\ x = -10

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The lines y = 6x + 9 and y = -51 meet at x = -10. 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.
$6x + 9 = -51$
2
Subtract 9 from both sides:
$6x + 9 - 9 = -51 - 9 \ \Rightarrow\ 6x = -60$
3
Divide both sides by 6:
$\frac{6x}{6} = \frac{-60}{6} \ \Rightarrow\ x = -10$
4
Check: put x = -10 back into the equation.
$6\cdot(-10) + 9 = -60 + 9 = -51 \checkmark$

LaTeX source of the formulas on this page

\[ 6x + 9 = -51\ \Rightarrow\ x = -10 \]
\[ 6x + 9 = -51 \]
\[ 6x + 9 - 9 = -51 - 9 \ \Rightarrow\ 6x = -60 \]
\[ \frac{6x}{6} = \frac{-60}{6} \ \Rightarrow\ x = -10 \]
\[ 6\cdot(-10) + 9 = -60 + 9 = -51 \checkmark \]

Trying values of x in 6x + 9 = −51

x	6x + 9	Equals -51?
-12	-63	no
-11	-57	no
-10	-51	yes
-9	-45	no
-8	-39	no

Questions

What is x in 6x + 9 = −51?

The solution of 6x + 9 = −51 is x = -10.

How do you solve 6x + 9 = −51?

Subtract 9 from both sides to get 6x = -60, then divide both sides by 6 to get x = -10.

How do I check the answer?

Replace x by -10: 6(-10) + 9 = -51, which is -51.

Solve 6x + 9 = −51

How to work it out

Trying values of x in 6x + 9 = −51

Questions

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