Two lines are graphed on the same coordinate plane. the lines only intersect at the point (3,6).which of these systems of linear equations could represent the two lines?

a. x=3
y=6

b. x=6+y
y=3+x

c. y=3x-3
y= x-1

d. x=3+y
y=6+x

e. y= x+3
y= 2x