Which of the following equations represents a line that passes through the points (0,−1) and (−9,2) ?I. y+2=31(x−3)II. 2x+6y=−6NeitherI onlyII onlyI and II
Q. Which of the following equations represents a line that passes through the points (0,−1) and (−9,2) ?I. y+2=31(x−3)II. 2x+6y=−6NeitherI onlyII onlyI and II
Calculate Slope: Find the slope of the line passing through the points (0,−1) and (−9,2). The slope m is calculated using the formula m=x2−x1y2−y1. m=−9−02−(−1)m=−92+1m=−93m=−31
Write Point-Slope Equation: Use the slope and one of the points to write the equation of the line in point-slope form.We can use the point (0,−1) and the slope −31.The point-slope form is y−y1=m(x−x1).y−(−1)=(−31)(x−0)y+1=(−31)x
Convert to Slope-Intercept Form: Convert the point-slope form to slope-intercept formy=mx+b to make it easier to compare with the given equations.y+1=(−31)xSubtract 1 from both sides to isolate y.y=(−31)x−1
Compare with Given Equations: Compare the derived equation y=(−1/3)x−1 with the given equations.I. y+2=(1/3)(x−3) does not match because the slope is positive 1/3 and the y-intercept is not −1.II. 2x+6y=−6 can be rewritten in slope-intercept form to check if it matches.Divide the entire equation by 6 to isolate y.(2x+6y)/6=−6/6(1/3)x+y=−1y=(−1/3)x−1This matches the derived equation.
Determine Correct Equation: Determine which of the given equations, if any, represent the line that passes through the points (0,−1) and (−9,2).Equation I does not represent the line because the slope and y-intercept do not match.Equation II does represent the line because, after simplification, it matches the derived equation.
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