anonymous
  • anonymous
can someone show me work? Can someone please help? Solve the system by substitution. -4.5x-2y=-12.5 3.25x-y=-0.75
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Multiply the second equation by 2: (3.25x-y=-0.75) x 2 =6.5x -2y=-1.5 Now subtract this new equation from the first one to eliminate y, i.e: -4.5x-2y=-12.5 -(6.5x -2y=-1.5) =>-11x+0=-11 x=-11/-11=1 put x back into the first eqn: -4.5(1)-2y=-12.5 -4.5-2y=12.5 -2y=12.5+4.5 y=-8.5 so, x=1, y=8.5.
anonymous
  • anonymous
thank you so much!! I relly appreciate it!! (:
anonymous
  • anonymous
you're welcome! :)

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anonymous
  • anonymous
wait when you subtract the -2 from the two wouldnt you get 4?
anonymous
  • anonymous
the -2y - 2y isnt that 4?
anonymous
  • anonymous
No, it's -2y-(-2y)=-2y+2y=0
anonymous
  • anonymous
ohhhh i see what you mean! Im sorry i got confused for a second! thank you again!
anonymous
  • anonymous
that's alright :)

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