Since value of k is same for y/x for all values in the table so, y varies directly with x
And equation is: 
Step-by-step explanation:
We need to find if y varies directly with x from the values given in the table.
If y varies directly with x then we have the equation:

where k is constant of proportionality
or we can write

If k is same for all values of x and y when (y/x=k) then we can say that y varies directly with x.
if x = -20 and y=45 then k is:

So, value of k is -2.25
if x = 1 and y=-2.25 then k is:

So, value of k is -2.25
if x = 12 and y=-27 then k is:

So, value of k is -2.25
Since value of k is same for y/x for all values in the table so, y varies directly with x
And equation is: 
Keywords: Direct Relationship
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Answer:
-40
Step-by-step explanation:
f(10)=-4(10)
f(10)=-40
Answer: 0.25 or 1/4
Step-by-step explanation:
1/2*2 = 1/2^2 = 1/4
Answer:
-0.89, 4/10, 1/2, 9/8, 2
Step-by-step explanation:
Answer:
Step-by-step explanation: