3.3 Equations in y=mx Form

Given x= 2 and y= 8; find the direct variation equation 

• y= 1/4x
• y=-4x
• y=4x
• y= -1/4x

y varies directly as x

• y = kx

• y = x

• x = ky

• x = y

Find the slope of the line that passes through the points
(2, 4) and (6, 12)

• 1/2
• -1/2
• 2
• -2

Tags

CCSS.8.EE.B.5

CCSS.8.EE.B.6

CCSS.8.F.B.4

CCSS.8.SP.A.3

Write an equation for this relationship.

• y=4x
• y=1/8x
• y=1/4x
• y=8x

Tags

CCSS.7.EE.B.4

CCSS.7.RP.A.2

The amount of money earned on a job is directly proportional to the number of hours worked.  If $70.00 is earned in 5 hours, how much money is earned in 22 hours of work?

• $2
• $308
• $1.57
• $265

Tags

CCSS.7.EE.B.3

CCSS.7.RP.A.1

CCSS.7.RP.A.2

CCSS.7.RP.A.3

Is the given table a direct variation? If so, what is the constant?

• Yes; 1/4
• Yes; 4
• Yes; 2
• No

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

Is this a direct variation?
y=2x

• yes
• no

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

Write the equation for the table given.

• y = 1/3x
• y = 3x
• y = 1/2x

Tags

CCSS.6.EE.C.9

Find the unit rate:  $3.60 for 3 pounds of apples. How much does it cost for 1 pound of apples?

• $1.00 per pound
• $3.60 per pound
• $1.20 per pound
• $1.10 per pound

Tags

CCSS.7.RP.A.1

CCSS.7.RP.A.2

Is this proportional?
y=2x

• yes
• no

Tags

CCSS.7.RP.A.2