Question

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

Answer 1

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!