9x+4y<8 −3x−7y≥5 ​ Is (1,-2) a solution of the system?

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

3x = 729 solve for x plz . it's urgent. will mark