The correct answer is d because every input is supposed to have exactly one output
Answer:
Check the explanation.
Step-by-step explanation:
As the graph of a linear function f passes through the point (-2,-10) and has a slope of 5/2.
As the slop-intercept form is given by:

where m is the slope and b is the y-intercept.
substituting the values (-2, -10) and m = 5/2 in the slop-intercept form to determine y-intercept.






And the equation of the line in the slope-intercept form will be:

putting b = -5 and slope = m = 5/2



Determining the zero of function.
As we know that the real zero of a function is the x‐intercept(s) of the graph of the function.
so let us determine the value of x (zero of function) by setting y = 0.





Therefore, the zeros of the function will be:
It equals 1/2. when dividing by a fraction you get the reciprocal of the second on which is 2/3 would now be 3/2 and you multiply it by 1/3. and get 1/2
To solve for u, you add 15 on both sides making it 5u=45, then divide 5 on both sides to got u alone..so making it u=9