Question 832314
Not sure you need a graphing calculator but graph paper would be good. 
The greater the slope (the x multiplier), the steeper the curve.
Pick a point {{{x=0}}}
Calculate {{{f(x)}}} and {{{g(x)}}}.
{{{f(0)=-5(0)+3/4=3/4}}}
{{{g(0)=-10(0)+3/4=3/4}}}
Both values equal {{{3/4}}}.
Now take 1 1 unit step in the x-direction {{{x=1}}}.
{{{f(1)=-5+3/4}}}
{{{g(1)=-10+3/4}}}
and look at the differences from when {{{x=0}}}
{{{f(1)-f(0)=-5+3/4-3/4=-5}}}
{{{g(1)-g(0)=-10+3/4-3/4=-10}}}
So a greater slope will provide a much greater rate of change in the function for an equal step size in x. 
 {{{ graph( 300, 300, -5, 5, -20,20, -5x+3/4,-10x+3/4) }}}