Answer:
y = 2x
Step-by-step explanation:
since x and y vary directly then the equation is
y = kx ← k is the constant of variation
to find k use the given condition y = 18 when x = 9
k = =
= 2, hence
y = 2x ← is the equation relating x and y
A weather balloon is launched in Texas from an altitude of 300 feet above sea level. If the balloon is rising at a constant spee
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