If `x=1` then find `x+y=-2,y=?`

If (2x + 3,y-1) =(3,5) , then find x and y.

If 3x-7y=10\ and x y=-1, find the value of 9x^2+49 y^2

If x^2+y^2=x^2y^2 then find the range of (5x+12 y+7x y)/(x y) .

If x^2+y^2=x^2y^2 then find the range of (5x+12 y+7x y)/(x y) .

If the points (x_1, y_1),(x_2,y_2), and (x_3, y_3) are collinear show that (y_2-y_3)/(x_2x_3)+(y_3-y_1)/(x_3x_1)+(y_1-y_2)/(x_1x_2)=0

If x ,y in R and x^2+y^2+x y=1, then find the minimum value of x^3y+x y^3+4.

y=2^(1/((log)_x4) , then find x in terms of y.

Find the following product and verify the result for x =-1, y=-2: (3x-5y)(x+y)

If x,y in R^(+) such that x + y = 8, then find the minimum value of (1 + (1)/(x)) (1 + (1)/(y))

If y=2^(-2^((1/(1-x))) , then find lim_(x->1^+)y