HELP ME PLEASE!!! A shopkeeper sells x pens and y pencils which cost RM3 and RM1 each respectively. The minimum total sales of the pencils sold is RM900. The number of pencils sold is at least twice the number of pens sold. The maximum number of pencils sold is 900.
question:
write three linear inequalities which represent the above situation.​

the reason why your question keeps getting deleted because this is not a school related question : )

i will answer your question though.

i never tried church's

hello from mrbilldoesmath!

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

discussion:

in general, the factorization of a^3 + b^3 is

a^3 + b^ 3 = (a + b) ( a^2 - ab + b^2)

in our case note that 343 = 7^3 and 216 = 6^3 so the equation becomes:

343x^3 + 216y^3 = (7x)^3 + (6y)^3

if you think of a (above) as 7x and b as 6y the factorization becomes

343x^3 + 216y^3 =

((7x + 6y) (   (7x)^2 - 7x*6y + (6y)^2)   =

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

you,

mrb

(a + b) (a^2 - a b + b^2)