Question

5a – 10b = 45, when b = 3?

Answer 1

If b = 3, and 5a - 10b = 45. Then "a" must be......

Okay, so let's plug in what we know: 5a - 10 x 3 = 45 or 5a - 30 = 45

We now know that 5a = 30 + 45 or 5a = 75

Then, divide: 75 / 5 = 15

a = 15!

Answer 2

5a - 10 * 3 = 45

5a - 30 = 45

5a = 75

a = 75 : 5

a = 15