x is meters, y is inches
Two points for line
(1 , 39.37) and (2 , 78.74)
we know right off that this line goes through the origin but anyway in our determination to follow the instructions we continue
(y - 39.37)/(x-1) = (78.74-39.37)/(2-1)
(y - 39.37)/(x-1) = 39.37
y - 39.37 = 39.37 x - 39.37
so as we knew at the start
y = 39.37 x
On a ruler that measures both metric and English units, we see that 1m=39.37 in. This implies that 2m = 78.74 in. Use this information to write an equation to convert x in. to y meters.
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