DIRECT VARIATION

DIRECT VARIATION

Multiple Choice

If y varies directly as x, and y=21 when x=7, what is the equation of variation?

• y=3x

• x=3y

• k=yx

• y=kx

Multiple Choice

If n varies directly as s, and n=10 when s=25, find n when s=30.

• n=15

• n=10

• n=12

• n=6

Multiple Choice

1.If r varies directly as the square of s and r=27 when

  s=3, what is the equation of variation?

• s=9r

• r=9s

• r=ks

• s=kr

Multiple Choice

2.If u varies directly as v and u=20 when v=8, find v when u=16.

• v=4

• v=5

• $$v=7$$  

• $$v=6.4$$