The key presses to in enter the two equations into the calculator are
shown above. Notice we use the
key for x shown by the second from the top arrow on the picture to our
left. And we use the parenthesis shown by the third arrow to insure the
14 and -4x are both divided by 3 in the first equation. Finally we use
negative key
shown by the bottom arrow for the negative 2 divisor in the second
equation. We used the
on the right side of the calculator when we wanted to subtract as in
14-4x. But if there is nothing to subtract from and we wish to denote a
negative number or the negative of a variable we must use
 .
Study how these two keys are used and make sure you understand when to
use each.
Finally press graph (top arrow) to graph the two equations.
We see the two equations do intersect as shown by the circle. We must
find the intersection.
|
divideboth sides by -2
then
to get to the screen at our left. We
need to find the coordinates of the intersection so we press 5 for
intersection from the menu.
