Rozwiaz układ równan.
{-2x+5y=-10
{7x-4y=8
-2x+5y=-10 /*7
7x-4y=8 /*2
-14x+35y=-70
14x-8y=16
_____________
27y=-54 /:27
y=-2
7x-4y=8
7x-4*(-2)=8
7x+8=8
7x=8-8
7x=0 /:7
x=0
Odp. x=0, y=-2
{7x-4y=
-2x = -10 - 5y/ : (-2)
7x - 4y = 8
x = 5 + 2,5y
7(5+2,5y) - 4y = 8
35 + 17,5y - 4y = 8
13,5y = -27/ :13,5
y = -2
x = 5 - 5
x = 0
Mam nadzieję, że pomogłam :)
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-2x+5y=-10 /*7
7x-4y=8 /*2
-14x+35y=-70
14x-8y=16
_____________
27y=-54 /:27
y=-2
7x-4y=8
7x-4*(-2)=8
7x+8=8
7x=8-8
7x=0 /:7
x=0
Odp. x=0, y=-2
{-2x+5y=-10
{7x-4y=
-2x = -10 - 5y/ : (-2)
7x - 4y = 8
x = 5 + 2,5y
7(5+2,5y) - 4y = 8
x = 5 + 2,5y
35 + 17,5y - 4y = 8
x = 5 + 2,5y
13,5y = -27/ :13,5
x = 5 + 2,5y
y = -2
x = 5 - 5
y = -2
x = 0
y = -2
Mam nadzieję, że pomogłam :)