Jen12abc
Jen12abc Jen12abc
  • 25-03-2017
  • Mathematics
contestada

Could someone help me do this using substitution I don't know how to do this for math

Could someone help me do this using substitution I dont know how to do this for math class=

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irspow
irspow irspow
  • 25-03-2017
x=y-7 and x=2-8y  if there is a solution x=x so

y-7=2-8y  add 7 to both sides

y=9-8y   add 8y to both sides

9y=9  divide both sides by 9

y=1, and since x=y-7

x=1-7=-6

So the solution is the point (-6, 1)
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KitKat69
KitKat69 KitKat69
  • 25-03-2017
If X=y-7 you put that into the other problem: y-7=2-8y. Then you combine like terms: 9y=9. Get the unknown by itself: divide both sides by 9: y=1. Then you put what y= into the first problem: X=1-7 then X=-6.
So X=-6, Y=1. :) hope this helps!
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