Question 919052
4p + 3n = 19  {{{n =p +.50}}}
4p + 3(p + .50) = $19
7p = $19 - $1.50
7p = $17.50
 p = $2.50, cost of a pen
............
And...checking ( n = $3.00)
4p + 3n = 19
$10 + $9 = $19