Rozwiąż równanie :
5x +2y = 7
x + y = 2
5x+2y=7
x+y=2
x=2-y
5(2-y)+2y=7
10-5y+2y=7
-3y=7-10
-3y=-3|:(-3)
y=1
x=2-1
x=1
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5x+2y=7
x+y=2
x=2-y
5(2-y)+2y=7
10-5y+2y=7
-3y=7-10
-3y=-3|:(-3)
y=1
x=2-y
x=2-1
x=1