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3x-4y=7 / *2
-2x+3y=-4 / *3
6x-8y=14
-6x +9y = -12
y= 2
6x - 8*2= 14
6x - 16 = 14
6x= 30 / 6
x= 5
y=2
y=2x+2
2x-3(2x+2)=6
y=2x+2
2x-6x-6=6
y=2x+2
-4x=6+6
-4x=12 |:(-4)
x = -3
y=2(-3)+2
x=-3
y=-6+2
x=-3
y=-4
b).
3x-4y=7 |*2
-2x+3y=-4 |*3
6x-8y=14
-6x+9y=-12
6x-8y-6x+9y=14-12
y=2
3x-4*2=7
y=2
3x-8=7
y=2
3x=15 |:3
y=2
x=5
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y=2x+2
2x-3y=6
y=2x+2
2x-3*(2x+2)=6
y=2x+2
2x-6x-6=6
y=2x+2
2x-6x=6 +6
y=2x+2
-4x=12 / :(-4)
y=2x+2
x=-3
y=2*(-3)+2
x=-3
y=-6+2
x=-3
y=-4
x=-3
b)
3x-4y=7 / *2
-2x+3y=-4 / *3
6x-8y = 14
-6x+9y = -12 dodajemy jedno do drugiego i x się zeruje
y = 2
3x-4y=7 / *3
-2x+3y=-4 / *4
9x-12y =21
-8x+12y =-16 dodajemy jedno do drugiego i y się zeruje
x = 5
x=5
y=2