Which is the direct linear variation equation for the relationship?

y varies directly with x and y = 10 when x = 2.

A.

y = x – 8

B.

y = x + 8

C.

y = 2x + 6

D.

y = 5x

Question

Which is the direct linear variation equation for the relationship?

    y varies directly with x and y = 10 when x = 2.
 
	
	
 
A.
	

y = x – 8
	
 
B.
	

y = x + 8
	
 
C.
	

y = 2x + 6
	
 
D.
	

y = 5x

anonymous · Answer

@mathstudent55

mathmale · Answer

If you see "y varies directly with x," immediately write the relationship    y = k x.

That 'k' is called the "proportionality constant," and it's your job to find its value.

mathmale · Answer

Substitute the given info into this equation:    y = 10 when x = 2

Can you now determine the value of k?