Rozwiąz równania:a)5(x+3) -3(y+4)=-1 2(x+y)-(3x+2y)=8 b)-2(x+y)+5(2x+y)=12 4(y-x)+3(x-y)=-7
a)
5x+15-3y-12=-1
2x+2y-3x-2y=8
-x=8
5x-3y=-4
x=-8
-40-3y=-4
-3y=36
y=-12
Odp.
b)
-2x-2y+10x+5y=12
4y-4x+3x-3y=-7
8x+3y=12
-x+y=-7 /*8
-8x+8y=-56
___________ +
11y=-44
y=-4
-x-4=-7
-x=-3
x=3
x=-3
a)5(x+3) -3(y+4)=-1
2(x+y)-(3x+2y)=8
x=-8b)-2(x+y)+5(2x+y)=12 4(y-x)+3(x-y)=-7
-x+y=-7
y=x-7
8x+3(x-7)=12
8x+3x-21=12
11x=33
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a)
5x+15-3y-12=-1
2x+2y-3x-2y=8
-x=8
5x-3y=-4
x=-8
-40-3y=-4
-3y=36
y=-12
Odp.
x=-8
y=-12
b)
-2x-2y+10x+5y=12
4y-4x+3x-3y=-7
8x+3y=12
-x+y=-7 /*8
8x+3y=12
-8x+8y=-56
___________ +
11y=-44
y=-4
-x-4=-7
-x=-3
x=3
Odp.
x=-3
y=-4
a)5(x+3) -3(y+4)=-1
2(x+y)-(3x+2y)=8
5x+15-3y-12=-1
2x+2y-3x-2y=8
5x-3y=-4
-x=8
y=-12
x=-8
b)-2(x+y)+5(2x+y)=12
4(y-x)+3(x-y)=-7
-2x-2y+10x+5y=12
4y-4x+3x-3y=-7
8x+3y=12
-x+y=-7
y=x-7
8x+3(x-7)=12
y=x-7
8x+3x-21=12
y=x-7
11x=33
y=-4
x=3