Question

2z+y=40
y+3x=110
z+2x=70

Answer 1

z=10
y=20
x=30

2(10) + 20 =40
20+3(30)=110

Answer 2

y+2 z = 40
3 x+y = 110
2 x+z = 70

y+2 z = 40
3 x+y = 110
2 x+z = 70

y = 40-2 z
3 x+y = 110
2 x+z = 70

y = 40-2 z
40+3 x-2 z = 110
2 x+z = 70

y = 40-2 z
40+3 x-2 z = 110
2 x+z = 70

y = 40-2 z
40+3 x-2 z = 110
z = 70-2 x

y = 40-2 z
40-2 (70-2 x)+3 x = 110
z = 70-2 x

40-2 (70-2 x)+3 x = (4 x-140)+3 x+40 = 7 x-100:

y = 40-2 z
7 x-100 = 110
z = 70-2 x

y = 40-2 z
7 x-100 = 110
z = 70-2 x

y = 40-2 z
7 x = 210
z = 70-2 x

y = 40-2 z
x = 30
z = 70-2 x

y = 40-2 z
x = 30
z = 10

y = 20
x = 30
z = 10



x = 30
y = 20
z = 10

saludos