układy równań 2 gim proszę o szybkie rozwiązanie!:)
a |2x-5y=2
|y=2x-10
b|x=4
|2x+y=10
c|x-3y=0
|x+y=-4
d|x+y=2
|x-y=1
a)
2x-5y=2
y=2x-10
2x-5(2x-10)=2
2x-10x+50=2
-8x=2-50
-8x=-48/:(-8)
x=6
y=2*6-10
y=2
b)
x=4
2x+y=10
2*4+y=10
8+y=10
y=10-8
c)
x-3y=0
x+y=-4
x=3y
3y+y=-4
4y=-4/:4
y=-1
x=3*(-1)
x=-3
d)
x+y=2
x-y=1
x=2-y
2-y-y=1
-2y=1-2
-2y=-1/:(-2)
y=1/2
x=1,5
y=0,5
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a)
2x-5y=2
y=2x-10
2x-5(2x-10)=2
y=2x-10
2x-10x+50=2
y=2x-10
-8x=2-50
y=2x-10
-8x=-48/:(-8)
y=2x-10
x=6
y=2*6-10
x=6
y=2
b)
x=4
2x+y=10
x=4
2*4+y=10
x=4
8+y=10
x=4
y=10-8
x=4
y=2
c)
x-3y=0
x+y=-4
x=3y
3y+y=-4
x=3y
4y=-4/:4
x=3y
y=-1
x=3*(-1)
y=-1
x=-3
y=-1
d)
x+y=2
x-y=1
x=2-y
2-y-y=1
x=2-y
-2y=1-2
x=2-y
-2y=-1/:(-2)
x=2-y
y=1/2
x=1,5
y=0,5