Given an expression such as 3x + 2y, find the value of the expression when x is equal to 4 and y is equal to 2.4.

Question

Can someone please explain how a multiple 2, 2.4 times?

Answer 1

Hi!

I'm not exactly sure what you're wanting here so I shall address a few things.

First, if we are using the expression 3x + 2y, we simply substitute in the x values.

So let's write it with brackets so we can see where we will put in the x and y values.

Now, eventually you won't need to do this but it should help with visualization.

We get:

3(x) + 2(y)

Then we substitute the x and y values for the x and y values provided, x=4 and y=2.4:

3(4) + 2(2.4)

So we multiply each of those.

3 multiplied by 4 = 12

and

2 multiplied by 2.4 = 4.8

Add both of those together to get the final sum.

12 + 4.8 = 16.8

Does that answer your question?

If not, please specify what it is you are looking for :)