Solve 11x + 15 = −51

The solution of 11x + 15 = −51 is x = -6.

11x + 15 = -51\ \Rightarrow\ x = -6

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The lines y = 11x + 15 and y = -51 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.
$11x + 15 = -51$
2
Subtract 15 from both sides:
$11x + 15 - 15 = -51 - 15 \ \Rightarrow\ 11x = -66$
3
Divide both sides by 11:
$\frac{11x}{11} = \frac{-66}{11} \ \Rightarrow\ x = -6$
4
Check: put x = -6 back into the equation.
$11\cdot(-6) + 15 = -66 + 15 = -51 \checkmark$

LaTeX source of the formulas on this page

\[ 11x + 15 = -51\ \Rightarrow\ x = -6 \]
\[ 11x + 15 = -51 \]
\[ 11x + 15 - 15 = -51 - 15 \ \Rightarrow\ 11x = -66 \]
\[ \frac{11x}{11} = \frac{-66}{11} \ \Rightarrow\ x = -6 \]
\[ 11\cdot(-6) + 15 = -66 + 15 = -51 \checkmark \]

Trying values of x in 11x + 15 = −51

x	11x + 15	Equals -51?
-8	-73	no
-7	-62	no
-6	-51	yes
-5	-40	no
-4	-29	no

Questions

What is x in 11x + 15 = −51?

The solution of 11x + 15 = −51 is x = -6.

How do you solve 11x + 15 = −51?

Subtract 15 from both sides to get 11x = -66, then divide both sides by 11 to get x = -6.

How do I check the answer?

Replace x by -6: 11(-6) + 15 = -51, which is -51.

Solve 11x + 15 = −51

How to work it out

Trying values of x in 11x + 15 = −51

Questions

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