What is the value of x?
4x − 6 = 18

You need to get rid of -6 by adding 6, you also need to add 6 to 18.

4x = 24

Now you need to get rid of the 4 attached to the variable, you do this by dividing 4 since it is multiplying, also dividing 4 and 24

x = 6

So the value of x is 6

Hope this helps! :)

x is the number of plates which costs $5 and y is the number of $10 plates.

the equation: 5x + 10y = 900 and y=2x

by solving these two equations, x=36 and y= 72, so the total number of plates is 108