Answer: draw a dot at -7 on the x-axis and a dot at positive 7 on the y-axis. then draw your line through the dots and across the graph using a ruler or just try drawing a straight line.
A department store buys 100 shirts at a cost of $2,400 and sells them at a selling price of $30 each.
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The account will have decreased by $2640 after 2/3 year.