You have to know what it is before you solve the problem
Beatrice is incorrect. All of these points are not on the same line because the slope between (-2 , -1) and (1, 0), which are coordinates from each of these pairs above are not equal to 1/2
Answer: 3 cat stickers and 1 bird sticker
<u>Step-by-step explanation:</u>
To guess, 7 cents total and values of 2 and 1.
I calculated how many times 2 went into 7 and then used the remainder of 1 for the other sticker.
3(2) + 1(1) = 7 
To solve mathematically, set up a system of equations:
Value: 2x + 1y = 7
Quantity: x + y = 4
Okay I can help you with your math!!