Answer: -8r+12
Step-by-step explanation:
Three hundred nine thousand seventeen.
We know that there are 21 buttons total. x is the number of small buttons and y is the number of large buttons.
Therefore, our first equation should be x+y = 21.
We know the small buttons sell for 3 dollars, meaning 3x represents how much is made from the small buttons. The larger buttons sell for 4 dollars, meaning 4y is how much is made from the large buttons.
We also know that the total of the buttons sold is 68 dollars. Therefore 3x + 4y = 68 is our second equation.
From this information, the answer is the first set.
8x - 5(x - 3) = 18
8x - 5x + 15 = 18
3x = 18 - 15
3x = 3
x = 3/3
x = 1
Option C.
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