Which graph represents a linear function

Which shows the image of rectangle abcd after the rotation (x, y) → (–y, x)?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1