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y=x-3 |*(-2)
y=2x+1
-2y-2x+6
-y=7
y=-7
y=2x+1
-7=2x+1
-8=2x
x=-4
y=x-3
x-3=2x+1
y=x-3
x=-2
y=-2-3
x=-2
y=-5
Odp. Rozwiązniem są liczby x=-2 ; y=-5
y=x-3
x = y+3
y = 2(y+3) +1
x = y+3
y = 2y+6 +1
x = y+3
y = 2y +7
x = y+3
y -2y = 7
x = y+3
y = -7
x = -7+3
x = -4
x = -4, y = -7