Rozwiąż układ równań metodą podstawiania
a) -2=3y-2
y-6x=-6
b) 0=5x+4y+14
x=3y+20
a)
-2=3y-2
y=-6+6x
-2=3(-6+6x)-2
-2=-18+18x-2
-18x=-18-2+2
18x=18/:2
x=1
y=-6+6*1
y=0
b)
0=5x+4y+14
0=5(3y+20)+4y+14
0=15y+100+4y+14
0=19y+114
-114=19y/:19
-6=y
x=3*(-6)+20
x=-18+20
x=2
3y-2=-2/+2
y-6x=-6/+6x
3y=0
-18+18x=0
5x+4y=-14
15y+100+4y=-14
19y=-114
y=-6
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a)
-2=3y-2
y-6x=-6
-2=3y-2
y=-6+6x
-2=3(-6+6x)-2
-2=-18+18x-2
-18x=-18-2+2
18x=18/:2
x=1
y=-6+6*1
y=0
b)
0=5x+4y+14
x=3y+20
0=5(3y+20)+4y+14
0=15y+100+4y+14
0=19y+114
-114=19y/:19
-6=y
x=3*(-6)+20
x=-18+20
x=2
a)
3y-2=-2/+2
y-6x=-6/+6x
3y=0
y=-6+6x
-18+18x=0
x=1
y=0
b)
5x+4y=-14
x=3y+20
15y+100+4y=-14
19y=-114
y=-6
x=2