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y=3x-10
2x+3y=3
2x+3(3x-10)=3
2x+9x-30=3
11x=3+30
x=33/11
x=3
y=3x-10
y=3.3-10
y=9-10
y=-1
2x-y=2.3-(-1)=6+1=7
3x-y = 10(kali 2) -> 6x-2y=20
---------------- -
11y=-11
y= -1
2x+ 3y=3
2x+3(-1)=3
2x+(-3)=3
2x=6
x=3
nilai 2x-y = 2.3 - (-1)
= 6+1
= 7