Question

If a * b + 5 *a + 3 * b + 15= 24 and a+ 3 =6 then what is the value of a+b​

Answer 1

a +b = 2

Explanation:

a +3 = 6

a = 6 -3

a = 3

Plugin a =3 in the equation,

a*b +5*a +3*b + 15 = 24

3b + 5*3 + 3b + 15 = 24

3b + 15 + 3b + 15 = 24 {combine like terms}

3b + 3b + 15 + 15 = 24

6b + 30 = 24 {Subtract 30 from both sides}

6b = 24 -30

6b = -6 {divide both sides by 6}

b = -6/6

b = -1

a + b = 3 + ( -1)

= 2