Which kind of function best models the data in the table? Graph the data and write an equation to model the data. x y 0 –1 1 –2 2 –3 3 –4 4 –5 exponential; y = 3x – 1

quadratic; y = x2 – 1

linear; y = x – 1

linear; y = –x – 1

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).

you need to add a picture