Solve 9x + 8 = 98

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

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

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The lines y = 9x + 8 and y = 98 meet at x = 10. 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.
$9x + 8 = 98$
2
Subtract 8 from both sides:
$9x + 8 - 8 = 98 - 8 \ \Rightarrow\ 9x = 90$
3
Divide both sides by 9:
$\frac{9x}{9} = \frac{90}{9} \ \Rightarrow\ x = 10$
4
Check: put x = 10 back into the equation.
$9\cdot10 + 8 = 90 + 8 = 98 \checkmark$

LaTeX source of the formulas on this page

\[ 9x + 8 = 98\ \Rightarrow\ x = 10 \]
\[ 9x + 8 = 98 \]
\[ 9x + 8 - 8 = 98 - 8 \ \Rightarrow\ 9x = 90 \]
\[ \frac{9x}{9} = \frac{90}{9} \ \Rightarrow\ x = 10 \]
\[ 9\cdot10 + 8 = 90 + 8 = 98 \checkmark \]

Trying values of x in 9x + 8 = 98

x	9x + 8	Equals 98?
8	80	no
9	89	no
10	98	yes
11	107	no
12	116	no

Questions

What is x in 9x + 8 = 98?

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

How do you solve 9x + 8 = 98?

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

How do I check the answer?

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

Solve 9x + 8 = 98

How to work it out

Trying values of x in 9x + 8 = 98

Questions

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