Write each pair of parametric equations as a single equation using only x and y. Graph this

Question:

Write each pair of parametric equations as a single equation using only x and y. Graph this new relation in a friendly graphing window. Verify that the graph of the new equation is the same as the graph of the pair of parametric equations.
a. x = t + 1
y = t2
b. x = 3t - 1
y = 2t + 1
c. x = t2
y = t + 3
d. x = t - 1
y = (4 - t2