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DiKsa [7]
4 years ago
5

Linear system word problem #4

Mathematics
1 answer:
Serjik [45]4 years ago
4 0
Drinks, x
popcorn, y

40.50 = 9x + 4y
38.25= 3x + 5y

Multiply the 2nd row by 3
<span>9x+4y=40.50</span>
<span><span><span>9x+15y=114.75

</span></span></span>Subtract the 2nd row from the 1st row
<span><span><span>−11y=−74.25
</span></span></span>Solve for <span><span>y

</span></span>Substitute <span><span><span>y=6.75
</span></span></span><span>9x+4(6.75)=40.50</span>
<span><span>9x+27=40.50
</span></span>Subtract <span>27</span> from both sides
<span><span><span>9x=40.50−27
</span></span></span>9x=13.<span>5
</span>Divide both sides by <span><span>9

I'll let you do some of the work ;)</span></span>

Hope this helps
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Read 2 more answers
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