Solve 10x − 8 = −28

The solution of 10x − 8 = −28 is x = -2.

10x - 8 = -28\ \Rightarrow\ x = -2

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The lines y = 10x − 8 and y = -28 meet at x = -2. 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.
$10x - 8 = -28$
2
Add 8 to both sides:
$10x - 8 + 8 = -28 + 8 \ \Rightarrow\ 10x = -20$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{-20}{10} \ \Rightarrow\ x = -2$
4
Check: put x = -2 back into the equation.
$10\cdot(-2) - 8 = -20 - 8 = -28 \checkmark$

LaTeX source of the formulas on this page

\[ 10x - 8 = -28\ \Rightarrow\ x = -2 \]
\[ 10x - 8 = -28 \]
\[ 10x - 8 + 8 = -28 + 8 \ \Rightarrow\ 10x = -20 \]
\[ \frac{10x}{10} = \frac{-20}{10} \ \Rightarrow\ x = -2 \]
\[ 10\cdot(-2) - 8 = -20 - 8 = -28 \checkmark \]

Trying values of x in 10x − 8 = −28

x	10x − 8	Equals -28?
-4	-48	no
-3	-38	no
-2	-28	yes
-1	-18	no
0	-8	no

Questions

What is x in 10x − 8 = −28?

The solution of 10x − 8 = −28 is x = -2.

How do you solve 10x − 8 = −28?

Add 8 to both sides to get 10x = -20, then divide both sides by 10 to get x = -2.

How do I check the answer?

Replace x by -2: 10(-2) − 8 = -28, which is -28.

Solve 10x − 8 = −28

How to work it out

Trying values of x in 10x − 8 = −28

Questions

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