When x=2 and y=4 what is value of 7x-y

You have to substitute each number in. So 7 (2) - 4=10

10

Step-by-step explanation:

So what we are doing in this question is simple substitution

So x = 2, y = 4

7x - y

So lets split it up first

7x

7 * (2)

We plugged in 2 for x

This is equal to 14

So the equation is looking like

14 - y

Now lets do the second part

- y

- (4)

We plugged in 4 for y

So no our equation looks like

14 - 4

= 10