What are the options for B and A?

Given an equation of x and y, express one variable explicitly and uniquely in terms of the other variable if it is possible. For example, for the equation a + 2y2 = 1, x = -2y'+ 1 (x can be expressed explicitly and uniquely in terms of y) y = impossible (y cannot be expressed explicitly and uniquely in terms of I) (a) 2x + 3y =0 O Oimpossible y = O 3 2y -3y Oimpossible (b) 2x + y2 =1 OV1- y2 O- zy Oimpossible y = O- 1x2 + 2 OVI - x2 COIN Oimpossible