Which equation represents a proportional relationship a)y=7x^2 or b)y=2+3x or c)y=1/2x or d)y=5-x

The graph of f(x) is obtained by reflecting the graph of f(x)=-3|x| over the x-axis. which equation describes f(x)? a) f(x)=3|x| b) f(x)=|x+3| c) f(x)=-3|x| d) f(x) = - |x+3|