Prosze o rozwiązanie nie tylko wyniki;)Rozwiąż układy równań:
a) x+2y=9
y-1=3x
b)x-y=2
1/2x-1=1/4y
c)-x-y=2
2(3x+y)=-20
d)4x+3y=54
1/3x=4(1+1/8y)
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a)
x+2y=9
y-1=3x
x=9-2y
y-1=3*9-2y
x=9-2y
y-1=21-2y
x=9-2y
y+2y=27+1
x=9-2y
3y=27/3
x=9-2y
y=9
x=9-2*9
y=9
x=9
y=9