Write the equation of the line that passes through the point (4,-2) and had a slope of -1/2

Acourt reporter is transcribing an accident report from germany. the report states that the driver was traveling 80 kilometers per hour. how many miles per hour was the driver traveling?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

6x + 3y = -6 2x + y = -2 a. x = 0, y = -2 b. infinite solutions c. x = -1, y = 0 d. no solution