Please help me with math! Thank you!?

Question

Question attached. Thanks!

Update:

Options for the first one: (1) straight line that doesn't pass through the origin, (2) not be a straight line, (3) straight line that passes through the origin. Options for the second one are the same. 

The third: (1) neither loans, (2) both loans, (3) Hank's loans only, (4) Lynn's loans only. Thanks!

Answer 1

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Hank's loan:

(1) straight line that doesn't pass through the origin

 

Lynn's loan:

(3) straight line that passes through the origin

 

Proportional for:

(4) Lynn's loans only.