Solve 8x + 1 = 73

The solution of 8x + 1 = 73 is x = 9.

8x + 1 = 73\ \Rightarrow\ x = 9

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The lines y = 8x + 1 and y = 73 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.
$8x + 1 = 73$
2
Subtract 1 from both sides:
$8x + 1 - 1 = 73 - 1 \ \Rightarrow\ 8x = 72$
3
Divide both sides by 8:
$\frac{8x}{8} = \frac{72}{8} \ \Rightarrow\ x = 9$
4
Check: put x = 9 back into the equation.
$8\cdot9 + 1 = 72 + 1 = 73 \checkmark$

LaTeX source of the formulas on this page

\[ 8x + 1 = 73\ \Rightarrow\ x = 9 \]
\[ 8x + 1 = 73 \]
\[ 8x + 1 - 1 = 73 - 1 \ \Rightarrow\ 8x = 72 \]
\[ \frac{8x}{8} = \frac{72}{8} \ \Rightarrow\ x = 9 \]
\[ 8\cdot9 + 1 = 72 + 1 = 73 \checkmark \]

Trying values of x in 8x + 1 = 73

x	8x + 1	Equals 73?
7	57	no
8	65	no
9	73	yes
10	81	no
11	89	no

Questions

What is x in 8x + 1 = 73?

The solution of 8x + 1 = 73 is x = 9.

How do you solve 8x + 1 = 73?

Subtract 1 from both sides to get 8x = 72, then divide both sides by 8 to get x = 9.

How do I check the answer?

Replace x by 9: 8(9) + 1 = 73, which is 73.

Solve 8x + 1 = 73

How to work it out

Trying values of x in 8x + 1 = 73

Questions

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