Why there must be at least two lines on a given plane ?

there must be at least two lines on any plane because a plane is defined by 3 non-collinear points.

Step-by-step explanation:

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Step-by-step explanation:

We know that

Bananas cost $0.40 per pound.

The coupon offers a $0.25 discount of the total purchase.

Let's call pounds and the cost of pounds.

The function that models this problem is

This expression states that each pound costs $0.40, and there's a discount of $0.25 in the final price.

Therefore, the function is