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2x+5y=10/*4
-5x-20y=-55
8x+20y=40
3x=-15/3
x=-5
-5+4y=11/+5
4y=16/4\
y=4
e)
4x+5y= -4/*7
6x+7y= -6/*(-5)
28x+35y=-28
-30x-35y=30
-2x=2/(-2)
x=1
4+5y=-4/-4
5y=-8/5
y=-1,6
f)2x-11y=73/*3
3x-4y=47/*(-2)
6x-33y=219
-6x+8y=-94
-25y=125/(-25)
y=-5
2x+55=73/-55
2x=18/2
x=9