anonymous
  • anonymous
Solve the system of equations 5x-y=3 and -10x+2y=-6 Answers: A; 0.-3 B: -3.0 C: 3,12 D: no solution E: infinitely many solutions
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
isolate y in the first equation
anonymous
  • anonymous
can you do that?
anonymous
  • anonymous
I don't think so... Am I rewriting the first equation?

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anonymous
  • anonymous
ya you want y by itself
anonymous
  • anonymous
first add y to both sides
anonymous
  • anonymous
5x=3+y
anonymous
  • anonymous
then subtract 3 from both sides
anonymous
  • anonymous
y=5x-3
anonymous
  • anonymous
now plug in (5x-3) for y in the second equation
anonymous
  • anonymous
-10x+2(5x-3)=-6
anonymous
  • anonymous
now try and solve for x
anonymous
  • anonymous
-10x+4=-6?
anonymous
  • anonymous
no, foil out 2(5x-3)
anonymous
  • anonymous
Wouldn't I have to do 2 times 5 then 2 times 3
anonymous
  • anonymous
2 times 5 plus 2 times -3
anonymous
  • anonymous
*2 times 5x
anonymous
  • anonymous
2 times 5x= 10x 2 times =3= -6
anonymous
  • anonymous
thats right, so we have -10x + 10x - 6 = -6
anonymous
  • anonymous
simplify that
anonymous
  • anonymous
Simplify? Like break it down again
anonymous
  • anonymous
you want to get x by itself to solve it
anonymous
  • anonymous
Do you minus one of them on both sides
anonymous
  • anonymous
lets just look at the x's. what is -10x + 10x?
anonymous
  • anonymous
0..
anonymous
  • anonymous
that's right
anonymous
  • anonymous
Yayy
anonymous
  • anonymous
so what should be your answer?
anonymous
  • anonymous
0,-3?
anonymous
  • anonymous
no, how did you get -3? anyways, since the x's cancel out there can't be a solution to this system of eqaution
anonymous
  • anonymous
Ah okay >< sorry, thanks for your help!
anonymous
  • anonymous
no problem

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