Is y=10x + 7 linear or not and how pls don't put random stuff

Brent wants to know what is 5 x 1/2

To make a monster appear large in a movie, a human actor wore a costume and walked through a scale model of a city. the scale used was 1 inch = 15 feet. the actor is 60 inches tall. how tall does the monster appear in the movie? question 5 options: 720 feet 75 feet 4 feet 900 feet

How to solve a simultaneous equation involved with fractions?