{3x+2y=13
{x-5y=-7
układy równań
3x+2y=13
x-5y=-7/ * (-3)
-3x+15y=21
17y= 34 / :17
y = 2
x-5y= -7
x- 5*2= -7
x-10=-7
x= -7+10
x= 3
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3x+2y=13
x-5y=-7/ * (-3)
3x+2y=13
-3x+15y=21
17y= 34 / :17
y = 2
x-5y= -7
x- 5*2= -7
x-10=-7
x= -7+10
x= 3