anonymous
  • anonymous
solve the system by graphing {-2x=2y-4 {2x-y=-5 Help walk through this please.
Mathematics
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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anonymous
  • anonymous
solve the system by graphing {-2x=2y-4 {2x-y=-5 Help walk through this please.
Mathematics
katieb
  • katieb
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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freckles
  • freckles
-2x=2y-4 multiplying both sides of this equation by -1 gives 2x=-2y+4 so replace 2x in the second equation with (-2y+4)
freckles
  • freckles
oops solve by grahping
freckles
  • freckles
forgot to read that part

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freckles
  • freckles
write both equations in the form y=mx+b this form is fun to play with because it tells you the slope m and the y-intercept b
anonymous
  • anonymous
-2x=2y-4 2x=-y-5
anonymous
  • anonymous
freckles
  • freckles
yes you need to write those in y=mx+b form
freckles
  • freckles
for example -2x=2y-4 can be written in that form by doing the following: add 4 to both sides -2x+4=2y 2y=-2x+4 (just wrote the equation the other way around) divide 2 on both sides y=-x+2 so here you see we have a slope of -1 and a y-intercept of 2
freckles
  • freckles
|dw:1443749426871:dw|
freckles
  • freckles
try doing this with the other line you have there
anonymous
  • anonymous
2x=-y-5 so do i add the 5 to 2x?
anonymous
  • anonymous
here is a nice picture http://www.wolframalpha.com/input/?i=-2x%3D2y-4+%2C2x-y%3D-5
anonymous
  • anonymous
oh okay

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