.A contractor bought 6.4ft^2 of sheet metal. He has used 2.1ft so far and has $77.40 worth of sheet metal remaining. The following equation represents how much sheet metal is remaining and the cost of the remaining amount. How much does sheet metal cost per square foot? Solve the following equation

a

step-by-step explanation:

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there is no graph so i cant sorry

step-by-step explanation:

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

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.

you,

mrb