rozwiąż układy równań :
a) x=-y
x-y= 6
b) y=x+3
2x+y=9
c) x-4y=15
y=4x
d) y=-2x-1
x=y+7
e) -3x=2y
y=1-x
f) 5x+6y=8
x=4y-1
prosze to na jutro
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a) -y-y=6
-2y=6
y=-3
x=3
b) 2x+x+3=9
3x=6
x=2
y= 5
c) x=15+4y
y=4(15+4y)
y=60+6y
y=-12
x=-3
d) x=-2x-1+7
3x=6
x=2
y=-5
e)-3x=2(1-x)
-3x=2-2x
-x=2
x=-2
y=3
f) 5(4y-1) + 6y = 8
20y-5+6y = 8
26y=13
y=0,5
x=1