GRAPH
2. How many shirts would be sold at a price of $12 per t-shirt?
To trace on the graph, press Lq(Trace). Use $! to move the cursor. To select a specific value, type the value, in this case 12. A dialogue
box opens, press l. To mark a point and keep the coordinates on the display, press l a second time.
1. There is a price that is too high, meaning no shirts are sold. This point occurs at the x-intercept of the graph (where y = 0) and the value of x is a root of
the equation 2x + 40 = 0 .
To find the root, press Ly(G-Solv)q(ROOT). The result, $20, is shown at the bottom of the screen. To mark this intercept and keep
the coordinates on the display, press l a second time.
4. If 2x + 40 shirts are sold at price, x, then the number of dollars collected for the sale is x(2x + 40) or 2x
2
+ 40x .
To graph this function, first, deselect the previous equation by pressing d, B so the cursor is on Y1, then press
q(SELECT)N. Note, the = sign is not highlighted. The cursor should now be on Y2. Press n2fs+40fl.
fx-CG50 Quick Start Guide 7
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