Question 273282
{{{a}}}= number of $8.50 brushes sold
{{{b}}} = number of $9.75 brushes sold
given:
(1) {{{a + b = 45}}}
(2) {{{850a + 975b = 38975}}} (in cents)
Multiply both sides of (1) by {{{850}}}
and subtract from (2)
I'd do it, but I lost my calculator