Zadanie 7 str 117 Matematyka z plusem , podpunkt f i g
f) . 2x+9y=-9
-3x+3y=8
g). 2x+3y=4
8x-5y=-1
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Zadanie 7 str 117 Matematyka z plusem , podpunkt f i g
f) . 2x+9y=-9
-3x+3y=8 / * (-3)
2x+9y=-9
9x-9y=-24
...............
11x=-33
x=-3
2*(-3)+9y=-9
9y=-9+6
9y=-3
y=-3/9
y=-1/3
x=-3
y=-1/3
g). 2x+3y=4 /* (-4)
8x-5y=-1
-8x-12y=-16
8x-5y=-1
...............
-17y=-17
y=1
-8x-12*1=-16
-8x=-16+12
-8x=-4
x=1/2
x=1/2
y=1