Answer: True! Yes, sine and cosine are called co-functions, where the sign function of any acute angle equals it’s co-function of the angles complement.
Answer:
0
Step-by-step explanation:
5²x+5=5
5²x=5-5
25x=0
x=0/25
x=0
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Answer: 
Explanation:
The equation of the unit circle is 
Plug in y = -2/7 and solve for x

Answer:
Step-by-step explanation:
a) Mark any two points in line a
(0,7) ; (5,-3)
Find the slope
slope = y2 - y1 /x2-x1

Equation: y-y1 = m(x-x1)
y - 7 = -2(x - 0)
y - 7 = -2x
y = -2x + 7 --------> line a
c) equation of line b
(2,-1); slope = -2 {as b line is parallel to line a}
y - y1 =m(x-x1)
y -(-1) = -2*(x - 2)
y + 1 = -2x - 2*-2
y + 1 = -2x + 2
y = -2x + 2 -1
y = -2x +1 ------> equation of line b