Rozwiąż Układy Równań Metodą Podstawiania :
a)
2(x+y)-3(x-y)=7
1/2 (x+y)=13
b)
4x-7y=0
2x=7/2y
c)
2(x+y)-3(x-y)=7
1/2 (x+y)=13
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a)
2(x+y)-3(x-y)=7
1/2 (x+y)=13
2x+2y-3x+3y=7
0,5x+0,5y=13
-x+5y=7
0,5x+0,5y=13
-x=7-5y / (-1)
0,5x+0,5y=13
x=-7+5y
0,5(-7+5y)+0,5y=13
x=-7+5y
-3,5+2,5y+0,5y=13
x=-7+5y
3y=13+3,5
x=-7+5y
3y=16,5/3
x=-7+5y
y=5,5
x=-7+5*5,5
y=5,5
x=20,5
y=5,5
b)
4x-7y=0
2x=7/2y
4x=7y /4
2x=7/2y
x=7/4y
2*7/4y=7/2y
x=7/4y
7/2y=7/2y /7,2
x=7/4y
y=y
c) to jest to samo co a).