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Schach [20]
4 years ago
13

−4x + 3y = 15, where x is time and y is velocity in kilometers per hour. Use this function to determine when a certain particle

will reach 40km/hr.
Mathematics
2 answers:
Nataly_w [17]4 years ago
6 0

26.25 hours = 26 hours 15 minutes

substitute y = 40 into the equation and solve for x

- 4x + 120 = 15 ( subtract 120 from both sides )

- 4x = - 105 ( divide both sides by - 4 )

x = 26.25 hours = 26 hours 15 minutes


tankabanditka [31]4 years ago
4 0
You need to substitute y for the 40 km/hr.
So -4x + 3(40) = 15
-4x + 120 = 15
-4x = 105
x = 26.25 sec
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