- Saiyan

Need help I will give medal

- jamiebookeater

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- Saiyan

##### 1 Attachment

- 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

ok hold on

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## More answers

- Saiyan

I put 2 in for x and still didnt get -23.5

- campbell_st

which equation did you use..?

- Saiyan

1 and 3

- Saiyan

get out of here

- Saiyan

hello

- campbell_st

well in equation 1
\[-2.5 \times (-2)^2 + 4.5 \times (-2) - 4.5 = ?\]

- Saiyan

sorry -10+-9-4.5

- campbell_st

so is that equal to the y value you need..?

- Saiyan

-24.5

- Saiyan

its not -23.5 if that is what you are asking

- campbell_st

you may want to check that -19 - 4.5 = -23.5
u

- Saiyan

oops missed that

- Saiyan

so its the first one

- campbell_st

well you may like the check with the 3rd point... just to make sure

- Saiyan

ok i will hold on

- Saiyan

for the second one i got -4.5

- campbell_st

I think you need to check your calculations
\[-2.5\times (4)^2 + 4.5 \times 4 - 4.5 = ?\]

- Saiyan

i put in a -2

- campbell_st

I'm using the 3rd point on the 1st equation...

- Saiyan

but its -26.5

- campbell_st

Isn't that what you want, for the 3rd point in the 1st equation...

- Saiyan

i just want to know how to do this

- 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

ok... so do you understand that the y- intercept for the points given is
(0, -4.5)..?

- Saiyan

ohhhh ok i get what your saying

- 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

ok thx

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