5. y varies directly as x. If constant (k) is 7 , what is x if y = 28?
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Answer:
x=4
Step-by-step explanation:
k=7
y=28
x=?
y=kx
substitute the given values
28=7x
Divide both sides by 7(to isolate the variable)
28/7=7x/7
4=x
checking:
y=kx
substitute the given values
28=7(4)
28=28