anonymous
  • anonymous
what is the solution of the system? Y=-8x-2 and Y=-6x+4 (-3,22) (-8/3,1/22) (-14/3,6/22) (3/14,-6/14) will give medal for correct answer
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
pooja195
  • pooja195
Use susbstituion :) plug equation 1 into equation 2
pooja195
  • pooja195
\[\huge -6x+4=-8x-2\]
welshfella
  • welshfella
you can either solve the system or plug in the given values to see if they fit eg for first one y = 22 -8x - 2 = -8(-3) - 2 = 24 - 2 = 22 they both come to same value so thay fit for first equation Now try the same values for y = -6x + 4 and see if they fit

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anonymous
  • anonymous
i think its a
welshfella
  • welshfella
r u sure ?
welshfella
  • welshfella
be confident
anonymous
  • anonymous
im not sure
welshfella
  • welshfella
what does -6(-3) + 4 work out to?
anonymous
  • anonymous
22
welshfella
  • welshfella
so?
anonymous
  • anonymous
it is a
welshfella
  • welshfella
right
anonymous
  • anonymous
thank you
anonymous
  • anonymous
could you help me with this one how many solutions does the system have ? 12y=-3x+20 y=-1/4x+5/3
welshfella
  • welshfella
yw pooja195 's method was quicker than mine though as both -6x+4 and -8x - 2 are equal to y they are equal to each other so you only needed to plug x = 3 into his equation to see if LHS = RHS
welshfella
  • welshfella
the way to do these is to multiply one equation by a number so that the terms in y or x have the same coefficient ( the coefficient is the number in front of the x or y)
welshfella
  • welshfella
so as we have 12y in equation 1 and y in equation 2 we multiply the second one by 12 equation 1 12y = - 3x + 20 equation 2 12y = -3x + 20 - the same equation so how many solution s does this have?
anonymous
  • anonymous
1
welshfella
  • welshfella
No - Hint; you can put any value of x into the equation and work out a value of y - in fact many many values of x...
welshfella
  • welshfella
so theres not just 1 value theres ?
anonymous
  • anonymous
infinte
welshfella
  • welshfella
right infinite solutions
anonymous
  • anonymous
thank you so much

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