How do you evaluate a-2y when a=-2/3 and y=4/5?

1 Answer
JereJK .
Mar 5, 2018

You will get the answer -34/15

Explanation:

Evaluating something is basically substituting a value in for a variable. They give you value -2/3 for a, and they give you 4/5 for y. So when we sub those in we get the equation

-2/3 - 2(4/5)

So this looks pretty easy to solve. From here, if we use PEMDAS we see that we must multiply to by the fraction first and we get

-2/3-8/5

Since we can't subtract without like denominators we want to find the lowest common denominator, which in this case will be 15. Now we have our new fractions

-10/15-24/15

So if we subtract the two numerators we get -34

-34/15

And this fraction can't be simplified so it is our final answer. Hope this helps!

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