Question

Oblicz x i y
2/3y-3/4x=5
3(2y+x)=6

Answer 1

2/3y-3/4x=5  \*12
3(2y+x)=6  \:3

8y-9x=60
2y+x=2  ==>  x=2-2y

8y-9(2-2y)=60
8y-18+18y=60
26y=78  \:26
y=3

x=2-2y
x=2-(3*2)
x=2-6
x=-4

x=-4
y=3