Solve 10x − 8 = −38

The solution of 10x − 8 = −38 is x = -3.

10x - 8 = -38\ \Rightarrow\ x = -3

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The lines y = 10x − 8 and y = -38 meet at x = -3. 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.
$10x - 8 = -38$
2
Add 8 to both sides:
$10x - 8 + 8 = -38 + 8 \ \Rightarrow\ 10x = -30$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{-30}{10} \ \Rightarrow\ x = -3$
4
Check: put x = -3 back into the equation.
$10\cdot(-3) - 8 = -30 - 8 = -38 \checkmark$

LaTeX source of the formulas on this page

\[ 10x - 8 = -38\ \Rightarrow\ x = -3 \]
\[ 10x - 8 = -38 \]
\[ 10x - 8 + 8 = -38 + 8 \ \Rightarrow\ 10x = -30 \]
\[ \frac{10x}{10} = \frac{-30}{10} \ \Rightarrow\ x = -3 \]
\[ 10\cdot(-3) - 8 = -30 - 8 = -38 \checkmark \]

Trying values of x in 10x − 8 = −38

x	10x − 8	Equals -38?
-5	-58	no
-4	-48	no
-3	-38	yes
-2	-28	no
-1	-18	no

Questions

What is x in 10x − 8 = −38?

The solution of 10x − 8 = −38 is x = -3.

How do you solve 10x − 8 = −38?

Add 8 to both sides to get 10x = -30, then divide both sides by 10 to get x = -3.

How do I check the answer?

Replace x by -3: 10(-3) − 8 = -38, which is -38.

Solve 10x − 8 = −38

How to work it out

Trying values of x in 10x − 8 = −38

Questions

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