Make a proportion to get the answer the proportion will be

to give you the answer of 37.5
it is true
Y=1/2 c + 1=81 so the answer is a-True
For the equation
.. x - y = 4
you can divide by 4 to put the equation into intercept form. This form shows you both interecepts at once.
.. x/4 +y/(-4) = 1
The x-intercept is (4, 0).
The y-intercept is (0, -4).
The graph is shown below.