1. 4x - 2 = y
3x + 7y = 1,5
3x+7(4x-2)=1,5
3x+28x-14=1,5
31x=1,5+14
31x = 15,5 / : 31
x = 0,5
obliczam y
4*0,5-2=y
2-2=y
0=y
odp:
x=0,5
y=0
2. 2x - y = 10
x + 5y = -17
2x-y=10
x = -17-5y
podstawiam
2(-17-5y)-y = 10
-34-10y-y=10
-11y=10+34
-11y= 44 /: -11
y = -4
obliczam x
2x+4=10
2x=10-4
2x=6
x=3
x= 3
y=-4
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1. 4x - 2 = y
3x + 7y = 1,5
3x+7(4x-2)=1,5
3x+28x-14=1,5
31x=1,5+14
31x = 15,5 / : 31
x = 0,5
obliczam y
4*0,5-2=y
2-2=y
0=y
odp:
x=0,5
y=0
2. 2x - y = 10
x + 5y = -17
2x-y=10
x = -17-5y
podstawiam
2(-17-5y)-y = 10
-34-10y-y=10
-11y=10+34
-11y= 44 /: -11
y = -4
obliczam x
2x-y=10
2x+4=10
2x=10-4
2x=6
x=3
odp:
x= 3
y=-4