What is the best estimate for this object?

How can constraints be used to model a real-world situation?

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.

Is the ordered pair (-10, 7) a solution to the equation y = 17 – x? yes or no