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Sagot :
2) The next day they go to Melties. Al buys a cone with 3.6 oz of frozen yogurt for $4.47, and Beth buys a cone with 4.8 oz of frozen yogurt for $5.01. Find how much Melties charges per ounce of frozen yogurt and how much they charge for the cone.
Let
x ------> the number of ounces of frozen yogurt
y ------> the total charge
we have the ordered pairs
(3.6,4.47) and (4.8,5.01)
step 1
Find the slope pr unit rate
m=(5.01-4.47)/(4.8-3.6)
m=$0.45 per ounce
step 2
Find the equation in point slope form
y-y1=m(x-x1)
we have
m=0.45
(x1,y1)=(3.6,4.47)
substitute
y-4.47=0.45(x-3.6)
convert to slope intercept form
y-4.47=0.45x-1.62
y=0.45x+2.85
In this problem, the y-intercept or initial value correspond to the charge for the cone
so
$2.85
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