Find the value of x.

1.) 2x + y = 3 2.) x - 2y = -1 if equation 1 is multiplied by 2 and then the equations are added, the result is a.3x = 2 b.3x = 5 c.5x = 5

Find dy/dx using implicit differentiation ln(20+e^xy)=y

Determine if the equation defines y as a function of x: 2xy = 1. yes o no