Question 315805
Let x=number of $20.00 sets
Let y=number of $45.00 sets
{{{20x+ 45y = 6800}}}
There can only be whole number solutions for {{{x}}} and {{{y}}}
{{{45y = -20x + 6800}}}
{{{9y = -4x + 1360}}}
{{{y = -(4/9)*x + 1360/9}}}
The plot looks like:
{{{ graph( 500, 500, -50, 400, -50, 200, -(4/9)*x + 1360/9 ) }}}
Any x's that give a whole number result for y is a solution