》y=2x+3《《slope intercept form
y=mx+c is a slope intercept form where,
m = slope of the line
c = y-intercept
(x,y) = general point passing through the line y=mx+c
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(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)
the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,
a^3 + b^3 = (a + b) (a^2 - a b + b^2).
in our case
343x^3+216y^3 = (7x)^3 + (6y)^3
so take a = 7x and b = 6y in the above equation to get the answer.