How did geography affect trade along Africa’s coasts in ancient times? a The small number of natural harbors in Africa slowed coastal trade. b The calm seas of the Atlantic ocean allowed coastal trade to flourish. c Cataracts in rivers slowed trade along the coasts. d The Sahara made traveling difficult until camels were introduced.

To solve this system of equations by elimination, what operation could be used to eliminate the y-variable and find the value of x? 6x + 5y = 2 4x + 2y = 8 a) subtract 2 times the second equation from 3 times the first equation b) subtract 3 times the second equation from 2 times the first equation c) subtract 5 times the second equation from 2 times the first equation d) subtract 2 times the second equation from 5 times the first equation