Question

Select all that apply.

Answer 1

Answer:

• Options 1 and 3 are direct variation

Step-by-step explanation:

Direct variation is:

• y = kx

Options:

1.

• y = -x, k = -1, yes

2.

• y = 2x + 3, not a direct variation, no

3.

Try the input/output to determine the direct variation:

• 4 = 3k
• k = 4/3

Verify the other pairs:

• x = 6, y = 6(4/3) = 8
• x = 9, y = 9(4/3) = 12
• x = 12, y = 12(4/3) = 16
• x = 15, y = 15(4/3) = 20

This is also a direct variation

Answer 2

Answer:

1 and 3

Step-by-step explanation: