1.
Suppose
y
varies directly with
x
and
y
= -10 when
x
= 5. Write an equation relating
x
and
y
.
A.
y
= 2
x
B.
y
= -2
x
C.
D.
Hint
2.
Suppose y varies directly with
x
and
y
= 14 when
x
= 3.5. Write an equation relating
x
and
y
.
A.
B.
y
= -4
x
C.
D.
y
= 4
x
Hint
3.
Suppose
y
varies directly with
x
and
when
Write an equation relating
x
and
y
.
A.
B.
C.
D.
Hint
4.
Suppose
y
varies directly with
x
and
y
= 24 when
x
= 8. Write an equation relating
x
and
y
.
A.
y = -3
x
B.
y
= 3
x
C.
D.
Hint
5.
The direct variation equation
y
= 19.99
x
gives the total cost
y
of
x
DVDs at a store. Find the total cost of 5 DVDs.
A.
$99.95
B.
$119.94
C.
$94.95
D.
$99.80
Hint