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grade 9 math slope equations

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question: slove by comparison and check your solution?

a)2x-4y-5=0
3x+8y-4=0

my work so far:

2x-4y=5-------(1)
3x+8y=4-------(2)
_____________

6x-12y=15------(3) (3)-(4)
6x+16y=8-------(4)
____________________
28y/28 = 7/28

y= .25

2x-4(.25)=5
2x-1+5
2x/2 + 6/2
x = 3

ya i was wrong when i did my check, both sides werent equal, and i cant figure out why i was wrong in my work.PLEASE HELP!!!!!

  • grade 9 math slope equations -

    you subtraced the equations wrong.

    You should have gotten

    6x-12y=15------(3) (3)-(4)
    6x+16y=8-------(4)
    ____________________
    -28y = 7

    which leads to y=-1/4

  • grade 9 math slope equations -

    but i divided both sides by -28 though

  • grade 9 math slope equations -

    i did that and i got the same thing as before though?

  • grade 9 math slope equations -

    cool .....not

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