-- make a list of 20 or 30 small numbers
-- one at a time, put each number in place of 'y', and figure out what 'x' is
-- mark a point at the pair of numbers you have for (x, y) on the graph
-- after a while, you'll start to see the graph take shape, and you can fill in the gaps between the points
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(7y - 5)(y + 1)
That factors to y(y2 + 7y - 5)
Zero. There is no term with just y in it.
By following the directions in your textbook. Or you could try paying attention in class; that would probably work too.
Step 1: 3(7y2 + 24y - 16) Step 2: 3(7y - 4)(y + 4) Assuming original expression was equal to zero, y = 4/7 or -4