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Saiyan
 one year ago
Need help I will give medal
Saiyan
 one year ago
Need help I will give medal

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campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2well 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
 one year ago
Best ResponseYou've already chosen the best response.0I put 2 in for x and still didnt get 23.5

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2which equation did you use..?

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2well in equation 1 \[2.5 \times (2)^2 + 4.5 \times (2)  4.5 = ?\]

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2so is that equal to the y value you need..?

Saiyan
 one year ago
Best ResponseYou've already chosen the best response.0its not 23.5 if that is what you are asking

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2you may want to check that 19  4.5 = 23.5 u

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2well you may like the check with the 3rd point... just to make sure

Saiyan
 one year ago
Best ResponseYou've already chosen the best response.0for the second one i got 4.5

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2I think you need to check your calculations \[2.5\times (4)^2 + 4.5 \times 4  4.5 = ?\]

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2I'm using the 3rd point on the 1st equation...

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2Isn't that what you want, for the 3rd point in the 1st equation...

Saiyan
 one year ago
Best ResponseYou've already chosen the best response.0i just want to know how to do this

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2the 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
 one year ago
Best ResponseYou've already chosen the best response.2ok... so do you understand that the y intercept for the points given is (0, 4.5)..?

Saiyan
 one year ago
Best ResponseYou've already chosen the best response.0ohhhh ok i get what your saying

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2so 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
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