Y = -5x + 1
x = 1 , y = -4
x = 2 , y = -9
x = 3 , y = -14
so the answers are
(1,-4)
(2,-9)
(3,-14)
X is twenty
2x+6x+20=180
8x=160
X=20

The probability of getting 0 heads in 4 tosses (or equivalently, 4 tails) is

.
So the desired probability is
<h3>
Answer:</h3>

<h3>
Explanation:</h3>
Change
so that is has a common denominator. 
Make an equation. 
Add. 
Add. 
Divide both sides by 2. 
Convert to a mixed number. 