Solve 7x − 8 = −50

The solution of 7x − 8 = −50 is x = -6.

7x - 8 = -50\ \Rightarrow\ x = -6

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The lines y = 7x − 8 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 subtraction, then the multiplication.
$7x - 8 = -50$
2
Add 8 to both sides:
$7x - 8 + 8 = -50 + 8 \ \Rightarrow\ 7x = -42$
3
Divide both sides by 7:
$\frac{7x}{7} = \frac{-42}{7} \ \Rightarrow\ x = -6$
4
Check: put x = -6 back into the equation.
$7\cdot(-6) - 8 = -42 - 8 = -50 \checkmark$

LaTeX source of the formulas on this page

\[ 7x - 8 = -50\ \Rightarrow\ x = -6 \]
\[ 7x - 8 = -50 \]
\[ 7x - 8 + 8 = -50 + 8 \ \Rightarrow\ 7x = -42 \]
\[ \frac{7x}{7} = \frac{-42}{7} \ \Rightarrow\ x = -6 \]
\[ 7\cdot(-6) - 8 = -42 - 8 = -50 \checkmark \]

Trying values of x in 7x − 8 = −50

x	7x − 8	Equals -50?
-8	-64	no
-7	-57	no
-6	-50	yes
-5	-43	no
-4	-36	no

Questions

What is x in 7x − 8 = −50?

The solution of 7x − 8 = −50 is x = -6.

How do you solve 7x − 8 = −50?

Add 8 to both sides to get 7x = -42, then divide both sides by 7 to get x = -6.

How do I check the answer?

Replace x by -6: 7(-6) − 8 = -50, which is -50.

Solve 7x − 8 = −50

How to work it out

Trying values of x in 7x − 8 = −50

Questions

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