Question 127160
What you've got is 2 points (x,y) The points are:
(4,63) and (6,61). Given these 2 points, you can plot a line 
through them. The line looks like {{{y = mx + b}}}
You need to find {{{m}}} and {{{b}}}
For (4,63)
{{{63 = m*4 + b}}}
For (6,61)
{{{61 = m*6 + b}}}
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multiply the 2nd equation by {{{-1}}} and add them
{{{63 = m*4 + b}}}
{{{-61 = -m*6 - b}}}
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{{{2 = -m*2 }}}
{{{m = -1}}}
Now find {{{b}}}
{{{61 = -1*6 + b}}}
{{{b = 67}}}
The equation through the 2 points is {{{y = -x + 67}}}
check answer:
Does the line go through the given points?
Try (4,63)
{{{y = -x + 67}}}
{{{y = -4 + 67}}}
{{{y = 63}}}
Try (6,61)
{{{y = -x + 67}}}
{{{y = -6 + 67}}}
{{{y = 61}}}
OK