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7x+2y=1
2y=-3-3x / :2
7x+2y=1
y=(-3x-3)/2
7x+2y = 1
postawiamy y
7x+ 2((-3x-3)/2=1
7x-3x-3=1 / +3
4x=4 / :4
x=1
do pierwszego postawiamy wyliczone x
3x+2y=-3
3*1 +2y = -3
3+ 2y = -3 / -3
2y= -6 / :2
y = -3