Step-by-step explanation:
50, 278, 976, 6866, 68, 48.77, 68 1/9
Answer:
I think it would be 5 and 5 of each solution
It's A ...cos (90- theta) = sin theta
so A
If you expand out the brackets you get this,
(4+5i)(a+2i) = 4a + (5a)i + 8i - 10
The -10 comes from 5i * 2i.
Squaring i becomes -1.
Let's group the real stuff together,
and imaginary separately,
(4a - 10) + (5a + 8)i
For this to be purely imaginary,
the real part needs to be zero.
Therefore 4a - 10 = 0
Solve for a.
I believe that the answer for y is...
y= -ax+c/b
