Question

Solve: 2x+4y=20 and 2x-y=4

Answer 1

X=3.6

Y=3.2

Explanation:

1. 2x-y=4 which means 2x=4+y
2. 2x+4y = 20 which means 4+y+4y=20 ==> 4+5y=20
3. 5y = 20-4 = 16
4. y= 16/5 = 3.2
5. 2x=4+y=4+3.2=7.2
6. x = 7.2/2 = 3.6

Answer 2

Answer:
(x, y) = (18/5, 16/5)
OR
(x, y) = (3.6, 3.2)