8a - 4b = 20

5a - 8b = 62

What are the values of a and b?

a=2, b = (-1)

Step-by-step explanation:

8a-4b=20 / * (-2)

5a-8b=62

-16a+8b = - 40

5a-8b=62

now - 8+8=0 right? so the only parameter that we have is a.

-16a+5a = - 40+62

11a = 22 / (:11)

a=2

in order to find b, we will replace a with its value in one of the original equations (it doesn't matter which one you will choose). For instance, I chose the first one.

8*2-4b=20

-4b=20-16

-4b=4/: (-4)

b = - 1