1) 5 = 3x - y
5x - 2y = 7
2) x - 3y = 5
y + 3x = -5
3) 2x - 3y = 7
3x - 5y = 11
4) 5p - 2r = 21
3p + 5r = -6
1) 3x-y=5
5x-2y=7 |* (-2)
-6x+2y=-10
5x-2y=7
+ ---------------------
x=-3
5*(-3)-2y=7
-15-2y=7 |+15
-2y=22 |:(-2)
y=11
y + 3x = -5 |-3
x+3(-5-3x)=-5
x-15-9x=-5
-8x-15=-5 |+15
-8x=10 |:(-8)
x=- 1,25
y=-5-3(-1,25)
x=1,25
y=-5+3,75
y=2,25
3) 2x - 3y = 7| * (-3)
3x - 5y = 11 | * 2
-6x+9y=-21
6x-10y=22
-y=1 | * (-1)
y=-1
2x-3*1=7 |+3
2x=10 | :2
x=5
y= -1
4) nie umiem;(
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1) 3x-y=5
5x-2y=7 |* (-2)
-6x+2y=-10
5x-2y=7
+ ---------------------
x=-3
x=-3
5*(-3)-2y=7
-15-2y=7 |+15
-2y=22 |:(-2)
y=11
x=-3
2) x - 3y = 5
y + 3x = -5 |-3
x+3(-5-3x)=-5
x-15-9x=-5
-8x-15=-5 |+15
-8x=10 |:(-8)
x=- 1,25
y=-5-3(-1,25)
x=1,25
y=-5+3,75
x=1,25
y=2,25
3) 2x - 3y = 7| * (-3)
3x - 5y = 11 | * 2
-6x+9y=-21
6x-10y=22
-y=1 | * (-1)
y=-1
2x-3*1=7 |+3
2x=10 | :2
x=5
y= -1
4) nie umiem;(