Each semester, students enrolling at a community college must pay tuition costs of 50 per unit as well as a 35 student services fee. Write a linear equation that gives the total fees y to be paid by a student enrolling at the college and taking x units.
a) y = 50x + 35
b) y = 35x + 50
c) y = 50 + 35x
d) y = 35 + 50x
