Asked by Bryan
How do i use cross multiplication to decide wheather a proportion is true or false?
3/4 = 15/16
3/4 = 15/16
Answers
Answered by
Ms. Sue
3 * 16 =?? 4 * 15
Answered by
Bryan
4 * 15= 60
3 * 16= 48
now what i do? how do i know if its true or fasle?
3 * 16= 48
now what i do? how do i know if its true or fasle?
Answered by
Ms. Sue
Does 60 = 48??
Answered by
Bryan
Oh okay.. the number has to be the same in order for it to be true. So this problem would be false
Answered by
Ms. Sue
Right. By cross-multiplying, you've proved this proportion to be false.
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