I will only help with number one so you can learn how to do it. If you still dont understand, let me know and ill be here to help.
Step-by-step explanation:
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what you have to do is get the x to be on its own. So we need to get rid of the 4. Since it's a fraction and fractions are division, you need to multiply both sides by 4. The reason as to why you multiply is because multiplication is the opposite if division. By multiplying both sides you get rid of the four and you are left with:
To set up this equation you create 14x+12y=314 is equal to 7x+11y-247 (the x representing the number of blue berries, and y representing the number if blackberry pies. In the end.