# What is the value of a in the equation 5a – 10b = 45, when b = 3?

Mar 2, 2018

$a = 15$

#### Explanation:

5a – 10b = 45

When b=3, [By transposing method]

5a–(10xx3) = 45

$5 a - 30 = 45$

$5 a = 45 + 30$

$5 a = 75$

$a = \frac{75}{5}$

$a = 15$

~Hope this helps! :)

Mar 2, 2018

$a = 15$

#### Explanation:

Just put $10$ instead of $b$ in the equation to get:

$5 a - \left(10.3\right) = 45$

$5 a - 30 = 45$

Then add $30$ to both sides

$5 a = 75$

Then divide both sides by $5$

$a = 15$