Multiply each equation by a number that produces opposite coefficients for x or y 4x + 5y = 7 X =
3x - 2y = -12 X =

4x + 5y = 7   x 2

3x - 2y = -12  x 5

Step-by-step explanation:

i just did it and those are the correct answers

after 1 year: 221 deer

step-by-step explanation:

30% of 170 is 51. 170+51=221

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