no 2 dan 3? 50poin jawab sekarang

4x+5y=5....(1)
6x-10y=60.(2)
eliminasi y
4x+5y=5. (x2) 8x + 10y=10
6x-10y=60(x1 ). 6x - 10y =60
___________+
14x = 70
x= 70÷14
x= 5
subtitusi x=5 ke pers (1)
4x+5y=5
4(5)+5y=5
20+5y=5
5y= 5-20
y=-20÷5
y= -4