SAT Nonlinear functions Question

The functions fand g are defined by the given equations, where $x\ge 0$ , a and b are integer constants, $a<b$, and $a>1$. If $y=f(x)$ and $y=g(x)$ are graphed in the xy-plane, which of the following equations displays, as a constant or coefficient, the minimum value of the function it defines, where $x\ge 0$ ? I.$f(x)=a(0.63)$-bx III. $g(x)=a(1.37)\times +2+b$