Solve 8x − 3 = 45

The solution of 8x − 3 = 45 is x = 6.

8x - 3 = 45\ \Rightarrow\ x = 6

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The lines y = 8x − 3 and y = 45 meet at x = 6. 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.
$8x - 3 = 45$
2
Add 3 to both sides:
$8x - 3 + 3 = 45 + 3 \ \Rightarrow\ 8x = 48$
3
Divide both sides by 8:
$\frac{8x}{8} = \frac{48}{8} \ \Rightarrow\ x = 6$
4
Check: put x = 6 back into the equation.
$8\cdot6 - 3 = 48 - 3 = 45 \checkmark$

LaTeX source of the formulas on this page

\[ 8x - 3 = 45\ \Rightarrow\ x = 6 \]
\[ 8x - 3 = 45 \]
\[ 8x - 3 + 3 = 45 + 3 \ \Rightarrow\ 8x = 48 \]
\[ \frac{8x}{8} = \frac{48}{8} \ \Rightarrow\ x = 6 \]
\[ 8\cdot6 - 3 = 48 - 3 = 45 \checkmark \]

Trying values of x in 8x − 3 = 45

x	8x − 3	Equals 45?
4	29	no
5	37	no
6	45	yes
7	53	no
8	61	no

Questions

What is x in 8x − 3 = 45?

The solution of 8x − 3 = 45 is x = 6.

How do you solve 8x − 3 = 45?

Add 3 to both sides to get 8x = 48, then divide both sides by 8 to get x = 6.

How do I check the answer?

Replace x by 6: 8(6) − 3 = 45, which is 45.

Solve 8x − 3 = 45

How to work it out

Trying values of x in 8x − 3 = 45

Questions

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