What is the constant of proportionality in the equation y = 1 1/2x?

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.