Is this formula linear: y= 9-3.5x

Hello everybody. can anybody me come up with detailed study plan on what topics to study from algebra 1 & 2, trig, and any other topic nesscery for success as a new beginner in pre-calculus. i dont have much math history but the basics. this will greatly me.

Tcan be concluded that % of the seniors would prefer to see more candid pictures in this year's edition of the yearbook.

If square root x = -7, then x= -49 true or false