Step-by-step explanation:
-3x -10y = -20..... (1)
-5x -6y = 20..... (2)
from 1. x=(20-10y)3
put in eq.2
5 (20-10y)/3+6y=-20
100-50y+18y=-60
160=32y
y=160/32
y=5
x=-10
