4/3 = x/6
What is 8?
x/4 = 3/2
What is 6?
4/(n + 9) = 2/7
What is 5?
3/10 = (b + 7)/20
What is -1?
x/3 = (x + 4)/7
What is 3?
the coordinate (0,0) is called this
What is the origin