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Debra use http://www.webmath.com/equline1.html
You want to find the equation for a line that passes through the two points:
(4,3) and (1,5).
put these into
http://www.webmath.com/equline1.html
and it will explain the maths involved
is
from http://www.webmath.com/equline1.html
y=-2/3x+17/3
midpoint M so x increased 3 from point k so at point JK would have to have x as 7
y=2/3*7+17/3
y=14/3+17/3
y=31/3
y=10.3
point J should be 7,10.333333333333333333333333334
or 7, 10 and 1/3
http://www.webmath.com/equline1.html
common denominator 9
divide 9 on both sides of ratio assuming the comma is being used as a decimal point in the example
9 into eight is zero
move 8 to right of comma
9 into 0,81
is 9
0,9
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