posted by .

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

• 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

Similar Questions

1. equations

Can anyone check this answer out for me... 2(5-6y) = 2 x 5 , 2 x -6 = 10 - 12y or should the 12y appear before the 10 ?
2. math 012

will someone please double check my answer to this problem. the answer i get is a fraction, but not sure how to type it on here. 4(4y+2)=2(1+6y)+8 16y+8=2+12y+8 16y+8=10+12y -16 -16 8=-6+12y +6 +6 14=12y divide both by 12 and that …
3. grade 9 math slope equations

solve and comparison: a)4x-9y=4 6x+15y=-13 im so lost!!!!!
4. math

1. Solve for the indicated letter D=4e, for e The solution is e= 2. G(x) = 6/(6-5x) Choose the correct domain below {x|x is a real number and x ≠0} {x|x is a real number and x≠6/5} {x|x is a real number and x≥6/5} …
5. algebra

What are the factors of the following trinomial?
6. math

how to find the slope of the curve 17x^2+12xy=100-8y^2 at the point where y=1. -i already d/dx but i didn't know how to find the slope of curve bcus they only give y. d/dx=(-34x-12y)/(12x+16y)
7. math

how to find the slope of the curve 17x^2+12xy=100-8y^2 at the point where y=1. -i already d/dx but i didn't know how to find the slope of curve bcus they only give y. d/dx=(-34x-12y)/(12x+16y)
8. Math - PreCalc (12th Grade)

Which rectangular equation corresponds to these parametric equations?
9. Math- Need Help

If 5x +4y and 4x +3y =5 15x +12y =18 16x +12y = 20 31x/31= 38/31 x= 1 7/31 20x +16y =24 20x +15y = 5 31/y/31 = 29/31 y=29/31 x +y = 1 7/31 + 29/31 2 5/31
10. math

We consider the non-homogeneous problem {y''-16y} = {256x^{2}} First we consider the homogeneous problem {y''-16y} = 0 : 1) the auxiliary equation is a r^2+br+c = =0 . ________________ 2) The roots of the auxiliary equation are (enter …

More Similar Questions