The vertex form of the equation of a quadratic function is f(x)= a(c-h) squared 2n+k

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for

Use a calculator basically