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Which of the following equations represents a line that passes through the points 
(0,-1) and 
(-9,2) ?
I. 
y+2=(1)/(3)(x-3)
II. 
2x+6y=-6
Neither
I only
II only
I and II

Which of the following equations represents a line that passes through the points (0,1) (0,-1) and (9,2) (-9,2) ?\newlineI. y+2=13(x3) y+2=\frac{1}{3}(x-3) \newlineII. 2x+6y=6 2 x+6 y=-6 \newlineNeither\newlineI only\newlineII only\newlineI and II

Full solution

Q. Which of the following equations represents a line that passes through the points (0,1) (0,-1) and (9,2) (-9,2) ?\newlineI. y+2=13(x3) y+2=\frac{1}{3}(x-3) \newlineII. 2x+6y=6 2 x+6 y=-6 \newlineNeither\newlineI only\newlineII only\newlineI and II
  1. Calculate Slope: Find the slope of the line passing through the points (0,1)(0,-1) and (9,2)(-9,2). The slope mm is calculated using the formula m=y2y1x2x1m = \frac{y_2 - y_1}{x_2 - x_1}. m=2(1)90m = \frac{2 - (-1)}{-9 - 0} m=2+19m = \frac{2 + 1}{-9} m=39m = \frac{3}{-9} m=13m = -\frac{1}{3}
  2. Write Point-Slope Equation: Use the slope and one of the points to write the equation of the line in point-slope form.\newlineWe can use the point (0,1)(0,-1) and the slope 13-\frac{1}{3}.\newlineThe point-slope form is yy1=m(xx1)y - y_1 = m(x - x_1).\newliney(1)=(13)(x0)y - (-1) = (-\frac{1}{3})(x - 0)\newliney+1=(13)xy + 1 = (-\frac{1}{3})x
  3. Convert to Slope-Intercept Form: Convert the point-slope form to slope-intercept form y=mx+by = mx + b to make it easier to compare with the given equations.\newliney+1=(13)xy + 1 = (-\frac{1}{3})x\newlineSubtract 11 from both sides to isolate yy.\newliney=(13)x1y = (-\frac{1}{3})x - 1
  4. Compare with Given Equations: Compare the derived equation y=(1/3)x1y = (-1/3)x - 1 with the given equations.\newlineI. y+2=(1/3)(x3)y + 2 = (1/3)(x - 3) does not match because the slope is positive 1/31/3 and the y-intercept is not 1-1.\newlineII. 2x+6y=62x + 6y = -6 can be rewritten in slope-intercept form to check if it matches.\newlineDivide the entire equation by 66 to isolate yy.\newline(2x+6y)/6=6/6(2x + 6y) / 6 = -6 / 6\newline(1/3)x+y=1(1/3)x + y = -1\newliney=(1/3)x1y = (-1/3)x - 1\newlineThis matches the derived equation.
  5. Determine Correct Equation: Determine which of the given equations, if any, represent the line that passes through the points (0,1)(0,-1) and (9,2)(-9,2).\newlineEquation I does not represent the line because the slope and yy-intercept do not match.\newlineEquation II does represent the line because, after simplification, it matches the derived equation.

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