Question 174653
{{{x}}} reresents the number of sale priced CD's
{{{12x}}}= The dollar amount Jerry paid for sale priced CD's
{{{y}}} represents the number of regular priced CD's
{{{15y}}}= The dollar amount Jerry paid for regular priced CD's
He can't pay more than the $125 gift card, so
{{{12x + 15y <= 125}}}
If I write this as an equality, then the equation represents
spending the gift card with no money left over, so
{{{12x + 15y = 125}}}
{{{15y = -12x + 125}}}
{{{y = (-4/5)x + 25/3}}}
I'll plot this
{{{ graph( 500, 500, -1, 15, -1, 12, (-4/5)x + 25/3) }}}
Jerry can purchase any combination of x's and y's that
are beneath this line or on the line
(6,3)
(8,1)
(1,7)
are all OK