The variables "X" and "Y" vary directly. Use the values to find the constant of proportionality.

2y=-4x

The radical equation 2+√2x-3 = √x+7 has a solution set [x= a0} and an extraneous root x = a1.

Can someone me and do the problem plz so i can understand it more better

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible