Question

Responde pra mim por favor

A) 4x-y=13
X+2y=10

B) 20y+3x=46
Y-x=0

C) 10x-15y=20
X+y=20

D) X+2y=10
25x-10y=10

Answer 1

a) x=10-2y
4(10-2y)-y=13
40-8y-y=13
9y=-27
y=-3

x=10-2(-3)
x=10+6
x=16

b) y=x
20(x)+3x=46
20x+3x=46
23x=46
x=2
y=2

c) x=20-y
10(20-y)-15y=20
200-10y-15y=20
-25y=20-200
-25y=-180(-1)
y=7,2

x=20-y
x=20-7,2
x=12,8

d)x=10-2y
25(10-2y)-10y=10
250-50y-10y=10
-60y=-240(-1)
y=4

x=10-2(4)
x=10-8
x=2