Question

t

Answer 1

what would this look like as a graph?

Answer 2

{(x, y) : x = 4} means "the set of all points of the form (x,y) such that x = 4"

so they really mean "the set of all points (4,y)"

Answer 3

{( x, y ) : y = 4} is very similar, but now focused on the y coordinate

it means "the set of all points (x,4)"

Answer 4

∩ means intersection

Answer 5

when you intersect 2 sets, you are just looking for everything they have in common

Answer 6

so b?

Answer 7

close, that's before you intersect the two sets

think of each line as a set (a set of points)

Answer 8

when you intersect the two sets, you're visually intersecting the lines

Answer 9

okay, then a.

thanks

Answer 10

yep

Answer 11

so this is just a really convoluted way of saying (4,4)