Question

When x is 2.25, y is 6.75 y varies directly with x write the direct variation equation in the form y = kx. direct variation equation find y when x is 4.2. when x = 4.2, y =?

Answer 1

Well 
when x=2.25 y=6.75 
y=kx 
that means if you put x= 2.25 you will get y=6.75
in this relation (y=kx)

6.75= 2.25k

k=6.75/2.25 =3 

the rel. is y=3x
whe x=4.2 
y= 3*4.2 =12.6

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