anonymous
  • anonymous
Solve this system of equations using substitution. Put your answer in ordered pair form, (x, y). x - 2y = -1 2x - y = 4
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
x - 2y = -1 2x - y = 4
anonymous
  • anonymous
Plug in a made up value for one of the variables to figure out what the other would be to make the equation valid. For example, if you set y to equal 1, then x has to equal 1, because 1 minus 2 equals -1.
anonymous
  • anonymous
need help fast

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anonymous
  • anonymous
if y equaled 2, x would have to equal 5 to satisfy the equations parameters, and those x and y values you achieve are your coordinates.
anonymous
  • anonymous
x=11 , y=6.
anonymous
  • anonymous
11,6 is not the answer
anonymous
  • anonymous
rewrite the first to x = -1+2y and inset in the second 2(-1+2y)-y=4 and solve -2+4y-y = 4 -2+3y=4 3y = 4+2 y = 6/2 y=3 x = -1+2y x=-1+2*3 x = 5
anonymous
  • anonymous
what is the answer?
anonymous
  • anonymous
x = 5, y = 3
anonymous
  • anonymous
5,3 is not the answer
anonymous
  • anonymous
sry 6/3 y = 2 x = 3
anonymous
  • anonymous
rewrite the first to x = -1+2y and inset in the second 2(-1+2y)-y=4 and solve -2+4y-y = 4 -2+3y=4 3y = 4+2 y = 6/3 y=2 x = -1+2y x=-1+2*2 x = 3
jhonyy9
  • jhonyy9
x-2y=-1 /2 2x-y=4 2x-4y=-2 2x-y=4 ---------- -- -3y=-6 y=-6/-3= 2 than y=2 --- 2x-2=4 --- 2x=6 --- x=6/2 =3 x=3 y=2

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