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lyudmila [28]
3 years ago
6

A car can travel 476 miles on 14 gallons of gas. Write an equation relating the distance d to the number of gallons g. How many

gallons of gas does this car need to travel 578 miles?
Mathematics
2 answers:
valina [46]3 years ago
7 0
D is directly proportional to g.

d α g

d = kg    where k = constant,  d =476,  g =14

476 = k*14

476/14 = k

k = 34

d = kg

d = 34g  is the equation.

When d = 578 miles,   g = ?

578 = 34g

g = 578/34

g = 17

17 gallons would be needed.
astraxan [27]3 years ago
5 0
Distance, d, is directly proportional to the number of gallons of gas, g. Thus,

d α g

To turn alpha to equal sign, we insert a constant of proportionality, k.

d=kg

To find k, we use the given conditions.
476 = k (14)
k = 34

Therefore, the equation is,
d = 34g

and for travelling 578 miles,
578 = 34g
g = 17 gallons is needed.

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