Answer:
see below
Step-by-step explanation:
"y varies directly as x" -> y=kx (let k reprsent cov)
1. y=kx (substitute the x and y values into this)
16=k(4)
k=4
COV: k=4
Equation: y=4x
2. 9=k(3)
k=3
COV: k=3
Equation: y=3x
3. 12=k(3/5)
k=20
COV: k=20
Equation: y=20x
4. (here i am plugging in 2 for y and 620 for x because they're the smallest numbers)
2=k(620)
k=1/310
COV: k=1/310
Equation: y=1/310x
5. (here i am plugging in 25 for y and 1 for x)
25=k(1)
k=25
COV: k=25
Equation: y=25x
