Nastepujace układy równań rozwiąż metodą przeciwnych współczynników :
a) \left \{ {{4x - 6y=2} \atop {4x+y-9=0}} \right.
Z góry dzięki :)
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a) 4x-6y=2
4x+y-9=0
4x-6y=2
4x+y=9 /*6
4x-6y=2
24x+6y=54
28x=56
x=2 4*2+y=9
y=9-8=1
b)3x-4y=-1
2x+y=3 /*4
3x-4y=-1
8x+4y=12
11x=11
x=1 2*1+y=3
y=3-2=1
c)2x+3y=-4 / *(-2)
5x+6y=-7
-4x-6y=8
5x+6y=-7
x=1 2*1+3y=-4
3y=-6 / :3
y=-2
d)7x+9y=8 / *8
9x-8y=69 / *9
56x+72y=64
81x-72y=621
137x=685 /:137
x=5 7*5+9y=8
9y=8-35
9y=-27 /:9
y=-3
e)2x+4y-10=0
-2x-5y=-18
2x+4y=10
-2x-5y=-18
-y=-8
y=8 2x+4*8=10
2x=10-32
2x=-22 /:2
x=-11
f)4(x+2)=1-5y
3(y+2)=3-2x
4x+8=1-5y
3y+6=3-2x
4x+5y=-7
2x+3y=-3 /*(-2)
4x+5y=-7
-4x-6y=6
-y=-1
y=1 2x+3*1=-3
2x=-6 /:2
x=-3
g)2(x+y)-3(x-y)=4
4(x+y)-7(x-y)=4
2x+2y-3x+3y=4
4x+4y-7x+7y=4
-x+5y=4 /*(-3)
-3x+11y=4
3x-15y=-12
-3x+11y=4
-4y=-8/:(-4)
y=2 -x+5*2=4
-x=4-10=-6 /-(-1)
x=6
h)x+2y=7
2x-y=4 / *2
x+2y=7
4x-2y=8
5x=15
x=3 3+2y=7
2y=4
y=2
j)2x-3y=8 /*5
7x-5y=-5 /*(-3)
10x-15y=40
-21x+15y=15
-11x=55
x=-5 2*(-5)-3y=8
-10 -3y=8
-3y=18
y=-6
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