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Galina-37 [17]
3 years ago
9

Tracy is finding the equation of a median-median line. She found that the equation of the line through the first and third summa

ry points is y = 0.4x + 38. Then she found that the equation of the line that is parallel to this line and passes through the second summary point is y = 0.4x + 59. What is the equation of the median-median line?. . a. y = 0.4x + 41. . b. y = 0.4x + 45. . c. y = 0.4x + 52. . d. y = 0.4x + 56.
Mathematics
1 answer:
rodikova [14]3 years ago
7 0
<span>1) Find the equation of the line that passes through (x1, y1) and (x3, y3).
We have it: </span>y = 0.4x + 38<span>2) Find the equation of the line parallel to the previous line that passes through (x2, y2). 
</span><span>That is: y = 0.4x + 59
</span><span>3) Find the weighted average of the
y-intercepts.  b=(b1+b2+b1)/3 = (38+59+38)/3
                      b= 45
The median-median line is the line parallel to the previous two lines with the weighted y-intercept.Hence, Y = 0.4 x + 45 is the answer</span>
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