If `x-y=8` , then which of the following must be true? Both `x` and `y` are positive. II. If `x` is negative, `y` must be positive III. If `x` is negative, `y` must be negative. (a) I only (b) II only (c) I and II (d) III only

If x+y=90^(@) , which of the following must be true?

If e(x,y) is negative, then which of the following is positive?

If x backslash and backslash y are negative,then which of the following statements is/are always true? x backslash+backslash y is positive.II xy is positive.III.x backslash is positive.I only (b) II only (c) III only (d) I and III only

If xylt0 , which of the following must be true? I. x+y=0 II. 2x-2ylt0 III. x^(2)+y^(2)gt0

If a = 3 + b , which of the following must be true? I. a > b + 2.5 II. a III. a > 2 + b

Which of the following relations are odd? I. y=2 II. y=x III. x^(2)+y^(2)=1

Write down the contrapositive of the following statements.: If x and y are negative integers, then x.y is positive.

h (x) = (2x+7)/(x-4) Which of the following must be true about h (x) ? I. h (14) =3.5 II. The domain of h (x) is all real numbers III. h(x) may be positive or negative

In which quadrant, the point (x, y) will lie? (Where x is a positive and y is a negative number).