Which of the following equations represents a line that passes through the points (4,−8) and (0,−5) ?I. 3x+4y=−20II. y+2=−43(x+4)NeitherI onlyII onlyI and II
Q. Which of the following equations represents a line that passes through the points (4,−8) and (0,−5) ?I. 3x+4y=−20II. y+2=−43(x+4)NeitherI onlyII onlyI and II
Find Slope: Find the slope of the line passing through the points (4,−8) and (0,−5). The slope m is calculated using the formula m=x2−x1y2−y1. m=0−4−5−(−8)m=−43m=−43
Write Point-Slope Equation: Use the slope and one of the points to write the equation of the line in point-slope form.Let's use the point (4,−8) and the slope −43.The point-slope form is y−y1=m(x−x1).y−(−8)=(−43)(x−4)y+8=(−43)(x−4)
Convert to Slope-Intercept: Convert the point-slope form to slope-intercept formy=mx+b to find the y-interceptb.y+8=(−43)(x−4)y=(−43)x+3+8y=(−43)x+11
Check Equation I: Check if equation I 3x+4y=−20 is the same line by rearranging it into slope-intercept form.3x+4y=−204y=−3x−20y=(−43)x−5
Check Equation II: Compare the slope and y-intercept of equation I with the line's slope and y-intercept from Step 3.The slope of equation I is −43, which matches the slope we found.The y-intercept of equation I is −5, which does not match the y-intercept we found (+11).Therefore, equation I does not represent the line passing through the points (4,−8) and (0,−5).
Check Equation II: Compare the slope and y-intercept of equation I with the line's slope and y-intercept from Step 3.The slope of equation I is −43, which matches the slope we found.The y-intercept of equation I is −5, which does not match the y-intercept we found (+11).Therefore, equation I does not represent the line passing through the points (4,−8) and (0,−5).Check if equation II (y+2=−(43)(x+4)) is the same line by rearranging it into slope-intercept form.y+2=−(43)(x+4)y1y2
Check Equation II: Compare the slope and y-intercept of equation I with the line's slope and y-intercept from Step 3.The slope of equation I is −43, which matches the slope we found.The y-intercept of equation I is −5, which does not match the y-intercept we found (+11).Therefore, equation I does not represent the line passing through the points (4,−8) and (0,−5).Check if equation II (y+2=−(43)(x+4)) is the same line by rearranging it into slope-intercept form.y+2=−(43)(x+4)y=−(43)x−3−2y=−(43)x−5Compare the slope and y-intercept of equation II with the line's slope and y-intercept from Step 3.The slope of equation II is −43, which matches the slope we found.The y-intercept of equation II is −5, which does not match the y-intercept we found (+11).Therefore, equation II does not represent the line passing through the points (4,−8) and (0,−5).
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