Question 207120
dl the FREE software at http://www.padowan.dk.com/graph/

For 1 and 2, use Function, Insert Relation
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To do them manually, as you'd have to do on a test:
Solve for y
x^2/16-y^2/25=1
{{{y = 5*(sqrt((x^2-16)/16))}}}
Pick values for x and solve for y.  Remember + and minus values, too.
eg
x  y
4  0
-4  0
5  15/4
-5  15/4  etc.
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Plot the points (4,0), (-4,0), 5,15/4) etc