What is the value of a in the equation 5a-10b=45 when b=3

Since b = 3 the equation changes

5a - 10 (3) = 45

5a - 30 = 45

(Add 30 to both sides)

5a = 75

Divide 5 to both sides

a = 15

If you would like to solve the equation 5 * a - 10 * b = 45, when b = 3, you can calculate this using the following steps:

b = 3

5 * a - 10 * b = 45

5 * a - 10 * 3 = 45

5 * a - 30 = 45

5 * a = 45 + 30

5 * a = 75 / 5

a = 75 / 5

a = 15

Result: The value of a is 15.