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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
ok hold on
I put 2 in for x and still didnt get -23.5
which equation did you use..?
1 and 3
get out of here
well in equation 1 \[-2.5 \times (-2)^2 + 4.5 \times (-2) - 4.5 = ?\]
so is that equal to the y value you need..?
its not -23.5 if that is what you are asking
you may want to check that -19 - 4.5 = -23.5 u
oops missed that
so its the first one
well you may like the check with the 3rd point... just to make sure
ok i will hold on
for the second one i got -4.5
I think you need to check your calculations \[-2.5\times (4)^2 + 4.5 \times 4 - 4.5 = ?\]
i put in a -2
I'm using the 3rd point on the 1st equation...
but its -26.5
Isn't that what you want, for the 3rd point in the 1st equation...
i just want to know how to do this
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
ok... so do you understand that the y- intercept for the points given is (0, -4.5)..?
ohhhh ok i get what your saying
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