Which THREE systems of linear equations are solved correctly? A)
If x + y = 3 and 2x + y = 12, then x = 9 and y = -6.
If 5x + y = 10 and x + 2y = 8, then x = .
10
B)
4
and y= 3
10
Ž and y=
C)
3
If x + y = 7 and 6x + 2 = 2, then x =
11
2
D)
If 2x + 2y = 4 and x - 4y = 12, then x = 4 and y = -2.
E
If 2x - 4y = 4 and x - 6y = 10, then x = 2 and y = 2.

step-by-step explanation:

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a precentage of 6th graders. the population is all 6th graders. let me know if i'm wrong, i hope this ! : )

step-by-step explanation:

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)

it has to have an angle of 90 degrees