Question

x+ 2y=20
x-y-5
como resolver

Answer 1

x+2y=20
x - y = 5 (.2)

x+2y= 20
2x-2y= 10

3x = 30
x = 30/3
x = 10

x+2y= 20
10+2y =20
2y = 20-10
2y=10
y=10/2
y=5

(10,5)

Answer 2

x + 2y = 20
x - y = 5 --> x = 5 + y

5 + y + 2y = 20
3y = 15
y = 5

x = 5 + y
x = 5 + 5
x = 10