Casio fx-CG10 PRIZM - Page 7

Getting Started with the fx-CG10
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 specic 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.
3. There is a price that is too high, meaning no shirts are sold. At that point, the x-intercept of the graph (y = 0) and the
value of x is a root of the equation
−2x + 40 = 0
.
To nd the root, press Ly(G-Solv)q(ROOT). The result, $20, is shown at the bottom of the screen. To mark
an 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, rst, 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.
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