Respuesta:
1) 3x + y = 16
x - 8y = -53
3x + y = 16
y = 16 - 3x
x - 8y = -53
53 + x = 8y
[tex]\frac{53 +x}{8}[/tex] = y
16 - 3x = [tex]\frac{53 +x}{8}[/tex]
8*(16 - 3x) = 53 + x
128 - 24x = 53 + x
128 - 53 = x + 24x
75 = 25x
3 = x
3 (3) + y = 16
9 + y = 16
y = 7
2)
1. 2x - 3y = -20
2. x + 4y = 56
2x - 3y = -20
2x = -20 + 3y
x = [tex]\frac{-20+3y}{2}[/tex]
x + 4y = 56
x = 56 - 4y
[tex]\frac{-20+3y}{2}[/tex] = 56 - 4y
-20 + 3y = 2 * (56 - 4y)
-20 + 3y = 112 - 8y
3y + 8y = 112 + 20
11y = 132
y = 12
x + 4 (12) = 56
x + 48 = 56
x = 56 - 48
x = 8
Te agradecería mucho si me das la coronita <3
