Question

sistemas lineares
2 x+ y= 10
x-3y=16

Answer 1

2x + y = 10
x - 3y = 16

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

x - 3y = 16
x - 3 (10 - 2x) = 16
x - 30 + 6x = 16
x + 6x = 16 + 30
7x = 46
x = 46/7

y = 10 - 2 . (46/7)
y = 10 - 92/7
y = (- 92 + 70)/7
y = - 22/7

x = 46/7, y = - 22/7

Answer 2

{2x+y=10
x-3y=16 (-2)

2x+y=10 somando esse sistema fica.
-2x+6y=-32
=7y=-22
y=22/7

2x+y=10
2x+22/7=10
2x=10-22/7
2x=48/7
x=48/14/2
x=24/2