Question 316562
Let {{{a}}} = number of $79 ones sold
Let {{{b}}} = number of $46 ones sold
given:
(1) {{{a + b = 24}}}
(2) {{{79a + 46b = 1302}}}
 Multiply both sides of (1) by {{{46}}} and
subtract (1) from (2)
(2) {{{79a + 46b = 1302}}}
(1) {{{-46a - 46b = -1104}}}
{{{ 33a = 198}}}
{{{a = 6}}}
and
{{{a + b = 24}}}
{{{6 + b = 24}}}
{{{b = 18}}}
6 $79 calculators and 18 $46 calculators were sold