Question 203681
a)we  see  that  the  total  price  is  the  sum  of  a  fixed  cost  and  a  variable  cost(x term).  the  fixed  numbers  are  similar(.7  and .85) and  the  variable  coefficient is  also  close ( .15  and  .11)

We  would  not  expect  these  to  be  perpendicular.  Very  special  case.
They  might  be  parallel  or  even  coincident,  but  again  rare
They  probably  are  intersecting  lines,  that  are  quite  similar.
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b)one  eqn  is  y=.15x+.7  the  other  is  y=.11 +.85
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These  are  not  parallel (equal) nor  perpendicular (negative  reciprocals)
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c) yes
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d)  intersect  at  ( 3.75, 1.2625)