1. rozwiąż podane układyrównań dowolną metodą
a) { y+2-(3-x)=0
x-2=5-(2-y)
b) { 3(x-y)+4x=8
3(x-5y)=5-9y
c) { 3(2x-1)+4(y-2)=9
2(5x-1)+3y=5(3x+y)+2
d) { 2(x+y)-3(x-2y)=-7x-2
5(x+1)-2(3-y)= -4(x+y)
e) { 4(x+2)-3(y-1)=x+y-3
3(x-4)-2(y-2)=4(x-y)+4
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a)
y+2-3+x=0
x-2=5-2+y
y+x=1
-y+x=5
2x=6 /:2
x=3
y+3=1
y=-2, x=3
b)
3x_3y+4x=8
3x-15y=5-9y
7x-3y=8 /*(-2)
3x-6y=5-9y
-14x+6y=-16
3x-6y=5
-11x=-11
x=1
3-6y=5
-6y=5-3
-6y=2
y=-1/3, x=1
c)
6x-3+4y-8=9
10x-2+3y=15x+5y+2
6x+4y=20
-5x-2y=4 /*2
6x+4y=20
-10x-4y=8
-4x=28 /:(-4)
x=-7
-5*(-7)-2y=4
35-2y=4
-2y=-31
y=15,5, x=-7
d)
2x+2y-3x+6y=-7x-2
5x+5-6+2y=-4x-4y
6x+8y=-2 /:2
9x+6y=1
3x+4y=-1 /*(-3)
9x+6y=1
-9x-12y=3
9x+6y=1
-6y=4
y=-2/3
9x+6*(-2/3)=1
9x-4=1
9x=5
x=5/9, y=-2/3
e)
4x+8-3y+3=x+y-3
3x-12-2y+4=4x-4y+4
3x-4y=-14
-x+2y=12 /*3
3x-4y=-14
-3x+6y=36
2y=22 /:2
y=11
3x-4*11=-14
3x=44-14
3x=30 /:3
x=10, y=11