anonymous
  • anonymous
Which system has (1, 3) as the solution? Which system has infinite solutions? Which system has (-8, 0) as the solution? Which system has no solutions? Which system has (-2, -2) as the solution? A) x + y = -1 4x + 4y = -4 B) x - 4y = -8 2x - 3y = -16 C) x + y = -4 -3x + 2y = 2 D) 4x + 6y = -12 2x + 3y = 9 E) x - y = -2 3x - y = 0
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
A) 4x+4y=-4(multi eq 1 with 4) 4x+4y=-4 subtract both eq we'll get 0 = 0
anonymous
  • anonymous
thats a right ?
anonymous
  • anonymous
wait thats the 4th one so A= 4

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anonymous
  • anonymous
or a = 2
anonymous
  • anonymous
B) 2x - 8y = -16(multi eq1 with 2) 2x - 3y = -16 subtracting both eqs -5y = 0 y=0 x= -8 (-8,0)
anonymous
  • anonymous
A system of eq has no solution
anonymous
  • anonymous
so A= is the 4th one like i said
anonymous
  • anonymous
yes
anonymous
  • anonymous
what bout the other two
anonymous
  • anonymous
can you solve the rest ???
anonymous
  • anonymous
Which system has (1, 3) as the solution?
anonymous
  • anonymous
B system of eq has solution set = (-8,0)
anonymous
  • anonymous
E) x - y = -2 3x - y = 0
anonymous
  • anonymous
that is correct right ?
anonymous
  • anonymous
wait
anonymous
  • anonymous
E) x - y = -2 3x - y = 0 subtracting both eqs -2x=-2 x= 1 y=3 (1,3) yes E has solution set (1,3)
anonymous
  • anonymous
Thought so..
anonymous
  • anonymous
is c the last option
anonymous
  • anonymous
C)2x +2 y = -8(multi with 2) -3x + 2y = 2 subtract both eqs 5x=-10 x= -2 y=-2 (-2,-2) C has solution set (-2,-2)
anonymous
  • anonymous
so i am right :)
anonymous
  • anonymous
yes :)
anonymous
  • anonymous
then D is the second one
anonymous
  • anonymous
D) 4x + 6y = -12 4x + 6y = 18(multi by 2) subtract both eqs 0 = -30 so D has infinite solutions

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