##### Across

**4.**Highest Common Factor**7.**A set of whole numbers**9.**Any number that can be written in p/q form**10.**Method of eliminating one of the variables**11.**A natural number greater than one that has no divisor other than one itself**13.**Two lines that do not meet**14.**An ________ is an equality containing one or more variable**15.**Method of substituting one variable to solve the other**17.**Least Common Multiple**18.**Any number that cannot be written in the p/q form**20.**Procedure or formula for solving a problem

##### Down

**1.**The sum of its positive divisor excluding the number itself is known as ______ number**2.**Two lines that lie on top of one another**3.**A statement that has been proven**5.**A curve formed by all points**6.**Tow or more lines that meet at a point**8.**A polynomial of degree 1**12.**Any integer that is greater than one and is not a prime number**16.**A decimal number that has digits that do not go on**19.**A _____ is a proven statement used for proving another statement