Without an equality sign the given terms can't be considered to be a straight line equation.
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An equation of a line requires two parameters. The slope, by itself, is not enough.
1) Solve the given equation for "y". The resulting equation will be in slope-intercept form, so you can immediately read off its slope. 2) Any line parallel to that line will have the same slope.
the slope will be positive 1.5x the whole equation is y=4.5+1.5x
x = -3 represents a vertical line whose slope is undefined.