Question 1027684
Let {{{ a }}} = the cost of 1 apple pie
Let {{{ s }}} = the cost of 1 ice cream sundae
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(1) {{{ 5a + 3s = 73 }}}
(2) {{{ a + 2s = 28.6 }}}
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Multiply both sides of (2) by {{{ 5 }}}
and subtract (1) from (2)
(2) {{{ 5a + 10s = 143 }}}
(1) {{{ -5a - 3s = -73 }}}
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{{{ 7s = 70 }}}
{{{ s = 10 }}}
and
(1) {{{ 5a + 3*10 = 73 }}}
(1) {{{ 5a = 43 }}}
(1) {{{ a = 8.6 }}}
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An apple pie costs $8.60
An ice cream sundae costs $10
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check:
(2) {{{ a + 2s = 28.6 }}}
(2) {{{ 8.6 + 2*10 = 28.6 }}}
(2) {{{ 28.6 = 28.6 }}}
You can check (1)
OK