The simple way:
-- Pick any number. Write it in place of 'x'.
-- Calculate the value of 'y'. (It's 7/2 of your number, minus 2)
-- Now you have one (x, y) point. Mark a dot at that point on the graph.
-- Pick another number. Write it in place of 'x'.
-- Calculate the value of 'y'. (It's 7/2 of your number, minus 2)
-- Now you have another (x, y) point. Mark a dot at that point on the graph.
-- Lay the edge of your ruler along the two dots on the graph.
-- Draw a straight line along the edge of the ruler, as far as you want
in each direction.
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The better way:
-- Look at the equation. Find the y-intercept of the graph. It's -2 .
-- Mark a dot on the y-axis at y=-2.
-- Look at the equation again. Find the slope of the graph. It's 7/2.
-- Draw a straight line with a slope of 7/2 through the dot on the y-axis.