If (x-1,y+4)=(1,2) then find x & y

If (x+y,x-y)=(1,2) find x and y

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

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

If (x+y): (x-y)= 4:1, then find the ratio (x^(2)+y^(2)):(x^(2)-y^(2))

22,If y prop x^(4) When x=1000,y=y_(1), then find the value of x so that value of y can be 2y_(1)(1)2000(2)11903)1410(4)4000

If sqrt(x+1)+sqrt(y)+sqrt(z-4)=(x+y+z)/(2), then find x+y+z

If y=propx^(4) When x=1000, y=y_(1) then find the value of x so that value of y can be 2y_(1) ,