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(3+x)/2=(2y+10)/4 |*4
5x-20+6y=12-x
6+2x=2y+10
6x+6y=32 |:6
2x-2y=4 |:2
x+y=5i1/3
x-y=2
x=5i1/3-y
5i1/3-y-y=2
x=5i1/3-y
-2y=-3i1/3 |:-2
x=5i1/3-y
y=1i2/3
x=3i2/3
czyli odpowiedź A
(3+x)/2=(2y+10)/4 /*4
5x-20+6y+x=12
6+2x=2y+10
6x+6y=32
2x-2y=4 /*3
6x-6y=12
6x+6y=32
--------------
12x=44
x=3 2/3
6y= 32-6*x
6y = 32-6*11/3
y=10/6=5/3=1 2/3
Odp. a jest poprawna