17. (-3, y) and (1, -7); m = -4

y-y1=m(x-x1) where (x1, y1)=(1, -7)

y+7=-4(x-1)

y+7=-4x+4

y+7=(-4x+4)*4

y+7=-x+16

y=-x+9

y=9−x

y−9=−x

−y+9=x

9−y=x

x=9−y

x=9−y

y*x=9 put 1 in for x

y=9

i dont understand the question? ?

step-by-step explanation:

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

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

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81