Section 5.1 step 9 help

Discovery
#1

Now, instead of solving to find the values of x and y, rewrite the following expressions so that a computer could figure out the values of x and y:

4x = 20
y + 3 = 21

#2

This is more like show your work.

Example

50x = 100

The expression would be x = 100/50. Hope that helps.

#3

Thank you I finally got it right