rozwiąukład równań
g]{-2x+5y=-10
7x-4y=8
h]{9x+8y=1
5x-6y=11
zad2
rozwiąż równanie i sprawdz
a]{x=4-3y
x+y=-6
b]{-2x+y=-8
4x-3y=2
c]{x+7y=22
y=5x-2
d]{x-3y=-4
5x-2y=-7
e]{-3x-2y=-2
2x+3y=-2
f]{y=2x-8
-12x+9y=-6
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g]{-2x+5y=-10 |*7
7x-4y=8 |*2
-14x+35y=-70
14x-8y=16
_____________
-27x=-54
x=2
7*2-4y=8
14-4y=8
-4y=-6
y=1,5
x=2
y=1,5
h]{9x+8y=1 |*6
5x-6y=11 |*8
54x+48y=6
40x-48y=88
______________
94x=94
x=1
9*1+8y=1
9+8y=1
8y=-8
y=-1
x=1
y=-1
zad2
a]{x=4-3y
x+y=-6
x+3y=4 |*(-1)
x+y=-6
-x-3y=-4
x+y=-6
______________
4y=-10
y=-2,5
x+3*(-2,5)=4
x-7,5=4
x=11,5
x=11,5
y=-2,5
b]{-2x+y=-8 |*2
4x-3y=2
-4x+2y=-16
4x-3y=2
_______________
-y=-14
y=14
-2x+14=-8
-2x=-22
x=11
x=11
y=14
c]{x+7y=22
y=5x-2
x+7y=22 |*5
-5x+y=-2
5x+35y=110
-5x+y=-2
________________
36y=108
y=3
x+7*3=22
x+21=22
x=1
x=1
y=3
d]{x-3y=-4 |*5
5x-2y=-7 |*(-1)
5x-15y=-20
-5x+2y=7
__________
-13y=-13
y=1
x-3*1=-4
x-3=4
x=7
x=7
y=1
e]{-3x-2y=-2 |*2
2x+3y=-2 |*3
-6x-4y=-4
6x+9y=-6
______________
5y=-10
y=-2
2x+3*(-2)=-2
2x-6=-2
2x=8
x=4
x=4
y=-2
f]{y=2x-8
-12x+9y=-6
-2x+y=-8 |*(-6)
-12x+9y=-6
12x-6y=48
-12x+9y=-6
_______________
3y=42
y=14
-2x+14=-8
-2x=-22
x=11
x=11
y=14