Asked by Selena
                Write the expression as a single fraction and simplify. 
3/a + 3/b
Is this when you cross multiply and get 3a + 3b? Except the answer has to be a fraction so I am not sure.
            
        3/a + 3/b
Is this when you cross multiply and get 3a + 3b? Except the answer has to be a fraction so I am not sure.
Answers
                    Answered by
            Steve
            
    You did the right thing to get the numerator. Now just put it all over the common denominator:
(3a+3b) / ab
when you're solving equations, the cross-multiplying affects both sides of the equation. When just evaluating an expression, you need to remember <u>why</u> you are cross-multiplying. It's to put everything over the common denominator.
    
(3a+3b) / ab
when you're solving equations, the cross-multiplying affects both sides of the equation. When just evaluating an expression, you need to remember <u>why</u> you are cross-multiplying. It's to put everything over the common denominator.
                    Answered by
            Selena
            
    Thank you!!!
    
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