Q. What is the equation of the line that passes through the point (4,0) and has a slope of −21 ?Answer:
Identify slope and point: Identify the slope and the point through which the line passes. The slope m is given as −21, and the line passes through the point (4,0).
Use point-slope form: Use the point-slope form of the equation of a line to plug in the values.The point-slope form is y−y1=m(x−x1), where (x1,y1) is a point on the line.Here, x1=4 and y1=0, so we substitute these values into the equation along with the slope m=−21.y−0=−21(x−4)
Simplify equation to slope-intercept form: Simplify the equation to get it into slope-intercept form, y=mx+b.y=−21(x−4)y=−21x+21⋅4y=−21x+2
Check equation for correctness: Check the equation to ensure it is in slope-intercept form and that it represents the correct slope and y-intercept.The equation y=−21x+2 is in slope-intercept form (y=mx+b), with m=−21 and b=2. This matches the given slope and the y-intercept can be confirmed by plugging x=4 into the equation to see if it yields y=0.−21⋅4+2=−2+2=0Since the point (4,0) satisfies the equation, there is no math error.
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