Which is NOT true about the solution to the equation?

x + 2.27 = 1.53

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

If 3 3/4 lb. of candy costs 20.25 how much would 1lb. of candy cost

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?