Direct Variation

Slope & Direct Variation

What is slope?

• Change in x (rise)

• Change in y (run)

• Try & start at the left most point

• Count the rise (how many you go up or down)

• Count the run (how many you go right)

• Simplify if needed ( :

Multiple Choice

What is the slope of this line in simplest form?

• 2/2

• 1

• -1/1

• -1

Multiple Choice

What is the slope of this line in simplest form?

• 7

• -1/6

• 1/6

• 6

Multiple Choice

What is the slope of this line in simplest form?

• 4/2

• 2

• -2/4

• -1/2

Multiple Choice

What is the slope of this line in simplest form?

• 2/2

• 1

• -1

• 1/1

Direct Variation

• must go through origin (0, 0)

• y=kx

• to solve for y, draw wall & box variable (think equations)

• to find k, draw wall & box k (think equations)

• you'll need to pick an x & y to plug in to find k

Multiple Choice

Is this direct variation?

• yes

• no

Multiple Choice

Is it direct variation?

• yes

• no

Multiple Choice

What is the equation?

Find k...

Use y = kx & plug in x & y

• x=2y

• y=2x

• y=-1/2x

• y=kx

Multiple Choice

What is the equation?

Find k...

Use y = kx & plug in x & y

• y=2x

• y=-2x

• y=1/2x

• y=-1/2x