The equation y=x-5, has a slope of "one". An equation in the form of y=mx+b has a slope of "m" and the y-intercept of "b".
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Points: (2, 5) and (-1, 5) Slope: 0 and so therefore it has no slope but is a straight line parallel to the x axis
Points: (3, 4) and (5, 4) Slope: (4-4)/(3-5) = 0 There is no slope and it is a straight line parallel to the x axis
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If the slope is undefined, it is a vertical line. Therefore the equation is x=2.
x - 5 is not an equation, it is an expression. It cannot represent a line and so there is no question of any slope. Since x is a variable, it can take on infinitely many values, thus the value of x - 5 depends on x. If we impose a variable y which will represents all the values produced by x - 5, then we form a linear equation with 2 variables, y = x - 5. As we know, this is the slope-intercept form of an equation, y = mx + b. Thus, the slope is 1.