Question

Find all real zeros of the function y=-3x+ 9.
-3
b. -3.9
C 3
d. 0,-3

Answer 1

There is only one zero for this function, and it takes place at x = 3

Which seems to agree with answer "c" in your list of options

Explanation:

This is the equation of a line with a slope different from zero, therefore, there is only one zero (crossing of the x-axis) for it. We can find it by solving for x when y = 0:

y = - 3 x + 9

0 = - 3 x +9

3 x = 9

x = 9/3

x = 3