To eliminate the terms and solve for y in the fewest steps, by which constants should the equations be multiplied by before adding the equations together?

Aregression was run to determine if there is a relationship between hours of tv watched per day (x) and number of situps a person can do (y). the results of the regression were: y=ax+b a=-0.662 b=30.418 r2=0.703921 r=-0.839

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

Petes dog weighed 30 pounds it then lost 16% of it's weight how much did pete lose