Twin brothers, billy and bobby, can mow their grandparent's lawn together in 53 minutes. billy could mow the lawn by himself in 20 minutes less time that it would take bobby. how long would it take bobby to mow the lawn by himself?

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.