Write an equation of the line with the given slope and y-intercept. 1. slope: 4
I-intercept: -9
a. y=-9x - 4

b. y = 4x - 9

C. y = 4m+9

d. y = -9x-4

all but the second one

step-by-step explanation:

cuz that one goes over 180

mark brainliest

2

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