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B)
x+4y=-2
3x-8y=10
C)
x-2y=3
-2x+y=0
D)
2x+y=9
5x-4y=3
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B)
x+4y=-2
3x-8y=10
x=-2-4y
3(-2-4y)-8y=10 --> -6-12y-8y=10
-20y=16 /20
y=- 4/5
y=- 0,8
y=-0,8
x=-2-4(-0,8)=-2+3,2=1,2
C)
x-2y=3
-2x+y=0
x=3+2y
-2(3+2y)+y=0 --> -6-4y=0
-4y=6 /-4
y= -1,5
y=-1,5
x= 3+2*(-1,5)=3+(-3)=0
D)
2x+y=9
5x-4y=3
y=9-2x
5x-4(9-2x)=3 --> 5x-36+8x=3
13x=39 /13
x=3
x=3
y=9-2*3=9-6=3