Solve 8x − 3 = 61

The solution of 8x − 3 = 61 is x = 8.

8x - 3 = 61\ \Rightarrow\ x = 8

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The lines y = 8x − 3 and y = 61 meet at x = 8. 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.
$8x - 3 = 61$
2
Add 3 to both sides:
$8x - 3 + 3 = 61 + 3 \ \Rightarrow\ 8x = 64$
3
Divide both sides by 8:
$\frac{8x}{8} = \frac{64}{8} \ \Rightarrow\ x = 8$
4
Check: put x = 8 back into the equation.
$8\cdot8 - 3 = 64 - 3 = 61 \checkmark$

LaTeX source of the formulas on this page

\[ 8x - 3 = 61\ \Rightarrow\ x = 8 \]
\[ 8x - 3 = 61 \]
\[ 8x - 3 + 3 = 61 + 3 \ \Rightarrow\ 8x = 64 \]
\[ \frac{8x}{8} = \frac{64}{8} \ \Rightarrow\ x = 8 \]
\[ 8\cdot8 - 3 = 64 - 3 = 61 \checkmark \]

Trying values of x in 8x − 3 = 61

x	8x − 3	Equals 61?
6	45	no
7	53	no
8	61	yes
9	69	no
10	77	no

Questions

What is x in 8x − 3 = 61?

The solution of 8x − 3 = 61 is x = 8.

How do you solve 8x − 3 = 61?

Add 3 to both sides to get 8x = 64, then divide both sides by 8 to get x = 8.

How do I check the answer?

Replace x by 8: 8(8) − 3 = 61, which is 61.

Solve 8x − 3 = 61

How to work it out

Trying values of x in 8x − 3 = 61

Questions

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