I do not know how to post the picture but the answers are
A. Y= -1/3x - 1
B. Y=-3x -1
C. Y=3x + 1
D. Y=3x - 1
slope = (y2-y1)/((x2-x1)
= (-4-2)/(1-(-1))
= (-6/2)
m = -3
point slope form
y-y1 = m(x-x1)
y-2 = -3(x-(-1))
y-2 =-3(x+1)
y-2 = -3x-3
y= -3x-3+2
y=-3x-1
Choice B
Answer:
see explanation
Step-by-step explanation:
Using the Addition/ Subtraction formulae for cosine
Consider the left side
cos(x - y) - cos(x + y)
= cosxcosy + sinxsiny - (cosxcosy - sinxsiny) ← distribute
= cosxcosy + sinxsiny - cosxcosy + sinxsiny ← collect like terms
= 2sinxsiny = right side ⇒ proven