X-6y>5
7x+2y≥4
is (10,-2) a solution of the system

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

If 1.4% of the mass of a human body is calcium, how many kilograms of calcium are there in a 165-pound man? 1.0 kg ca 5.1 kg ca 1.0 x 102 kg ca 5.1 x 102 kg ca