Consider this option:
1. rule: the equation will be the same if the both its parts are multiplied by one number ('0' is not included!).
2. using the rule, described upon:
-3x-2y=-7 (*(-1));
6x+4y=14 (*2);
-6x-4y=-14 (*(-2)).
Note, that not all the ways are described.
A composite number is a number that has at least 2 (if you count 1) whole number factor(if you count 1 as a factor)
whole numbers are numbers like 1,2,3,4 but not including -2,-4,-5
factors are numbers that make up another number so
the factors of 6 are 1,2,3 because 1 times 2 times 3=6
3 is not composite because the factors are 1,3
4, -2, 0
x is equal to a number that is less than 13
Let x = cost of bill prior to tip
![12+x=58.25](https://tex.z-dn.net/?f=%2012%2Bx%3D58.25%20)
![x=46.25](https://tex.z-dn.net/?f=%20x%3D46.25%20)
So, we know that before a tip was paid that the cost of the meal was $46.25. If there were three people at the dinner and we are trying to find the average spent <em>prior</em> to the tip, we can just divide.
Let a = average each person spent
![46.25/3=a](https://tex.z-dn.net/?f=%2046.25%2F3%3Da%20)
![a=15.42](https://tex.z-dn.net/?f=%20a%3D15.42%20)
On average, prior to the bill, each person paid approximately $15.42.