Solve the following system by substitution. Substitute the expression in the second equation and solve. y 18 y 5x - 2 (z, y) =( Preview Preview A regression analysis was performed to determine if there is a relationship between hours of TV watched per day () and number of sit ups a person can do (y). The results of the regression were: y=ax+b a=-0. 601 b=30.449 r2=0. 407044 r=-0.638 Use this to predict the number of sit ups a person who watches 13 hours of TV can do, and please round your answer to a whole number Solve the following system by solving one of the equations for x or y and then using the substitution method. 3y = 0 Ay = (z, y) = ( Preview Preview