Question

Sistemas

x+2y=4
3x+5y=15

Answer 1

{x + 2y = 4
{3x + 5y = 15

x + 2y = 4
x = 4 - 2y
x = 4 - 2 * (-3)
x = 4 + 6
x = 10


3x + 5y = 15
3 * (4 - 2y) + 5y = 15
12 - 6y + 5y = 15
-y = 3 .(-1)
y = -3