To na jutro!
z podręcznika matematyka z plusem 2, zadania 4,6 str 102
Zad 4.
f) x-3y=5
y+3x=-5
Zad 6.
b) 2x+y=14
8x+1/2y=35
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Zad.4
x-3y=5
y+3x=-5 /-3x
x-3y=5
y=-5-3x
x-3(-5-3x)=5
y=-5-3x
x+15+9x=5
y=-5-3x
10x= -10 / :10
y=-5-3x
x=-1
y=-5-3*(-1)
x=-1
y=-2
Zad.6
2x+y=14 /-2x
8x+1/2y=35
y=14-2x
8x+1/2(14-2x)=35
y=14-2x
8x+7-x=35 /-7
y=14-2x
7x=28 / :7
y=14-2x
x=4
y=14-2*4
x=4
x=4
y=6