Solve 10x + 8 = 98

The solution of 10x + 8 = 98 is x = 9.

10x + 8 = 98\ \Rightarrow\ x = 9

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The lines y = 10x + 8 and y = 98 meet at x = 9. 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.
$10x + 8 = 98$
2
Subtract 8 from both sides:
$10x + 8 - 8 = 98 - 8 \ \Rightarrow\ 10x = 90$
3
Divide both sides by 10:
$\frac{10x}{10} = \frac{90}{10} \ \Rightarrow\ x = 9$
4
Check: put x = 9 back into the equation.
$10\cdot9 + 8 = 90 + 8 = 98 \checkmark$

LaTeX source of the formulas on this page

\[ 10x + 8 = 98\ \Rightarrow\ x = 9 \]
\[ 10x + 8 = 98 \]
\[ 10x + 8 - 8 = 98 - 8 \ \Rightarrow\ 10x = 90 \]
\[ \frac{10x}{10} = \frac{90}{10} \ \Rightarrow\ x = 9 \]
\[ 10\cdot9 + 8 = 90 + 8 = 98 \checkmark \]

Trying values of x in 10x + 8 = 98

x	10x + 8	Equals 98?
7	78	no
8	88	no
9	98	yes
10	108	no
11	118	no

Questions

What is x in 10x + 8 = 98?

The solution of 10x + 8 = 98 is x = 9.

How do you solve 10x + 8 = 98?

Subtract 8 from both sides to get 10x = 90, then divide both sides by 10 to get x = 9.

How do I check the answer?

Replace x by 9: 10(9) + 8 = 98, which is 98.

Solve 10x + 8 = 98

How to work it out

Trying values of x in 10x + 8 = 98

Questions

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