The weight, w, of a plank varies directly with its length, (l). a 7.5 foot plank weighs 30 pounds. write an equation relating w and (l).
a. 225
b. 75
c. 3
d. 4(l)
explain i really don't understand and i have a test on the subject this week,

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

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If a line is defined by the equation y = 5x + 2, what is the slope?