Use numbers to explain the pattern you see when you count forward by tens

Whats the name of the vertical axis

Solve the system of equations y= 3/2 - 1, -x+ y =-3

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate.in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30