Which line on the graph below has a slope of zero

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1. the wheeling bridge in west virginia is about 307 meters long. if you walk with a stride of about meter, about how many steps would it take you to cross this suspension bridge?

Which of the points a(6, 2), b(0, 0), c(3, 2), d(−12, 8), e(−12, −8) belong to the graph of direct variation y= 2/3 x?

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18