Question 1060695
"a sandwich costs twice as much as a drink"
{{{X=2Y}}}
"3 sandwiches and 2 drinks for $16.oo"
{{{3X+2Y=16}}}
Substituting,
{{{3(2Y)+2Y=16}}}
{{{8Y=16}}}
{{{Y=2}}}
So then,
{{{X=2(2)}}}
{{{X=4}}}
Sandwiches are $4, drinks are $2.
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Elimination,
{{{X=2Y}}}
1.{{{X-2Y=0}}}
and
2.{{{3X+2Y=16}}}
Add eq. 1 and 2,
{{{X-2Y+3X+2Y=0+16}}}
{{{4X=16}}}
{{{X=4}}}
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Graphing,
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