If a line with a slope of -2 crosses the y-axis at (0,3), what is the equation of the line? i can't seem to understand the steps

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

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

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?