Q. Find the slope-intercept form for the line passing through (5,7) and parallel to the line passing through (3,3) and (−9,1).
Calculate Slope: First, we need to find the slope of the line that passes through the points (3,3) and (−9,1). The slope m of a line passing through two points (x1,y1) and (x2,y2) is given by the formula m=x2−x1y2−y1.
Find Parallel Line Slope: Using the points (3,3) and (−9,1), we calculate the slope as follows:m=(1−3)/(−9−3)m=(−2)/(−12)m=1/6The slope of the line passing through (3,3) and (−9,1) is 1/6.
Determine Y-Intercept: Since the line we are looking for is parallel to the line passing through (3,3) and (−9,1), it will have the same slope. Therefore, the slope of our line is also 61.
Substitute Values: Now, we need to find the y-intercept b of our line. The slope-intercept form of a line is y=mx+b, where m is the slope and b is the y-intercept. We have a point (5,7) that lies on our line and the slope m=61. We can substitute these values into the slope-intercept form to solve for b.
Solve for b: Substituting the point (5,7) and the slope 61 into the equation y=mx+b, we get:7=(61)⋅5+b
Common Denominator: To find b, we solve the equation:7=65+bTo isolate b, we subtract 65 from both sides of the equation:7−65=b
Subtract Numerators: To subtract 65 from 7, we need a common denominator. We can write 7 as 642:642−65=b
Calculate Y-Intercept: Now we subtract the numerators:(42−5)/6=b37/6=bThe y-intercept of our line is 37/6.
Final Slope-Intercept Form: We now have both the slope and the y-intercept for our line. The slope-intercept form of the line is: y=61x+637
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