What is the value of x in the solution to this system of equations y+2x=−1 y=1/2x+4

Given this information, which expression must represent the value of b?

Which best explains why this triangle is or is not a right triangle?

11. minitab software was used to find the lsrl for a study between x=age and y=days after arthroscopic shoulder surgery until an athlete could return to their sport. use the output to determine the prediction model and correlation between these two variables. predictor coef se coef t p constant -5.054 4.355 -1.16 0.279 age 0.2715 0.1427 1.9 0.094 r-sq = 31.16%