Saiyan
  • Saiyan
Need help I will give medal
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Saiyan
  • Saiyan
1 Attachment
campbell_st
  • campbell_st
well the y- intercept is given (0, -4.5) so that means you choices are the 1st or 3rd equations... so substitute -2 into both equations and see which gives y = -23.5 then when you have 1 equation just check against the 3rd point
Saiyan
  • Saiyan
ok hold on

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Saiyan
  • Saiyan
I put 2 in for x and still didnt get -23.5
campbell_st
  • campbell_st
which equation did you use..?
Saiyan
  • Saiyan
1 and 3
Saiyan
  • Saiyan
get out of here
Saiyan
  • Saiyan
hello
campbell_st
  • campbell_st
well in equation 1 \[-2.5 \times (-2)^2 + 4.5 \times (-2) - 4.5 = ?\]
Saiyan
  • Saiyan
sorry -10+-9-4.5
campbell_st
  • campbell_st
so is that equal to the y value you need..?
Saiyan
  • Saiyan
-24.5
Saiyan
  • Saiyan
its not -23.5 if that is what you are asking
campbell_st
  • campbell_st
you may want to check that -19 - 4.5 = -23.5 u
Saiyan
  • Saiyan
oops missed that
Saiyan
  • Saiyan
so its the first one
campbell_st
  • campbell_st
well you may like the check with the 3rd point... just to make sure
Saiyan
  • Saiyan
ok i will hold on
Saiyan
  • Saiyan
for the second one i got -4.5
campbell_st
  • campbell_st
I think you need to check your calculations \[-2.5\times (4)^2 + 4.5 \times 4 - 4.5 = ?\]
Saiyan
  • Saiyan
i put in a -2
campbell_st
  • campbell_st
I'm using the 3rd point on the 1st equation...
Saiyan
  • Saiyan
but its -26.5
campbell_st
  • campbell_st
Isn't that what you want, for the 3rd point in the 1st equation...
Saiyan
  • Saiyan
i just want to know how to do this
campbell_st
  • campbell_st
the 3rd point x = 4 -2.5 * 4^2 = -40 4.5 * 4 = 18 - 4.5 ---------- -26.5 so the 1st equation is true for the 3 points... I wouldn't go any further
campbell_st
  • campbell_st
ok... so do you understand that the y- intercept for the points given is (0, -4.5)..?
Saiyan
  • Saiyan
ohhhh ok i get what your saying
campbell_st
  • campbell_st
so substitute x = 0 into the equations and the only ones that give y = -4.5 are the 1st and 3rd so next use the point x = -2 y = -23.5 substitute x = -2 and see if you get y = -23.5 this happens in the 1st equation, the 3rd equation gives y = -17.5 I think... so lastly use the 3rd point to check the 1st equation is the answer... the point (4, -26.5) substitute x = 4 and see if you get -26.5 that's a simple process that uses elimination...using some observation and arithmetic
Saiyan
  • Saiyan
ok thx

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