Trigonometry question help?

Question

Construct parametric equations describing the graph of the following equation.

y=7x^2+6x−7

If x=1+t, find the parametric equation for y.

Answer 1

y= 7x^2 + 6x - 7

x= 1+ t

Replace x by 1+ t in the first equation.

y= 7(1+t)^2 + 6(1+t) -7

y=7(1+2t+t^2) +6+6t-7

y=7+14t+7t^2+6+6t-7

y=7t^2+20t+6