Nilai y dari sistem persamaan x+2y=-3 2x-y=4​

Jawaban:

x+2y= -3

2x-y= 4

_________ –

-x + 3y = -7

-x = -7 – 3y

x = 7+3y

2(7+3y) – y = 4

14+6y-y = 4

14+5y = 4

5y = 4-14

5y = -10

y = -2