Maths - add 2/5y + 9/y-6?
or:Maths - add 2/5y + 9/y-6?or:First you need to improve your presentation. We use parentheses to group things.2/5y + 9/y - 6 This could be 2 over (
or:Maths - add 2/5y + 9/y-6?
or:First you need to improve your presentation. We use parentheses to group things.2/5y + 9/y - 6 This could be 2 over (5y) or (2/5)y and we can't tell which. Likewise the second term could be 9/(y - 6) or it could be as you have written it. I will guess at your meaning, but you should never make people guess. A math statement should have exactly one possible interpretation.x = 2/(5y) + 9/(y - 6) Because without an equal sign you don't have a question, and you can't get an answer when you don't know what the question is.Get a ruler in your hands. Measure things until you start to understand how a ruler works. Measure some stuff and figure out where the center is. Say you measure a book and it's 7/8\" thick. You look at your ruler and see that every eighth is divided into two sixteenths, so obviously half of 7/8\" is going to be 7/16\". If you write that out you have 1/2 x 7/8 = 7/16. And you notice that 1/2 is divided into 2/4 and then into 4/8 and so on, so you can convert anything to anything by multiplying all the numbers on top and then all the numbers on bottom.Other rulers are divided into 10 and 100 parts. But an inch is still an inch, so anything on one ruler can be translated to the other ruler. A half inch on one ruler is 5/10 or 50/100 on the other. An eighth inch is just 12.5 marks when you have 100 marks per inch. A metric ruler divides an inch into 25.4 parts, so a half inch would be 12.7 of those parts. Pretty simple, isn't it? Practice this a bit and people will think you went to wizard school.x = 2/(5y) + 9/(y - 6) First you need to get these on the same ruler and you do that by cross-multiplying. That means multiplying by (5y)(y - 6)/(5y)(y - 6) which equals 1, but watch what happens.x = 2(y - 6) + 9(5y) See? Those fractions went away and it looks exactly as if we \"cross multiplied\".x = 2y - 12 + 45yx = 47y - 12
Tags:
