Slope is 1/2. The equation to solve it is y2-y1 / x2-x1. I hope you understand it now :)
Answer:
the question is incomplete, so I looked for a similar one:
<em>After the release of radioactive material into the atmosphere from a nuclear power plant, the hay was contaminated by iodine 131 ( half-life, 8 days). If it is all right to feed the hay to cows when 10% of the iodine 131 remains, how long did the farmers need to wait to use this hay? </em>
iodine's half life (we are given x, we need to find b):
0.5A₀ = A₀eᵇˣ
x = 8 days
we eliminate A₀ from both sides
0.5 = eᵇ⁸
ln 0.5 = ln eᵇ⁸
-0.69315 = b8
b = -0.69315 / 8 = -0.08664
since the farmers need to wait until only 10% of the iodine remains (we already calculated b, now we need to find x):
0.1A₀ = A₀eᵇˣ
0.1 = eᵇˣ
ln 0.1 = bx
where b = -0.08664
x = ln 0.1 / -0.08664 = -2.302585 / -0.08664 = 26.58 days
Answer:
(x, y) = (8, 2)
Step-by-step explanation:
substitute x = 4y into the other equation
2(4y) + 4y = 24
8y + 4y = 24
12y = 24 ( divide both sides by 12 )
y = 2
substitute y = 2 into x = 4y
x = 4 × 2 = 8
solution is (8, 2 )
-0.15 = -15/100 = -3/20
-7.75 = -7 3/4
-12.54 = -12 54/100 = -12 27/50
Answer:
5x + 2y = 9
Step-by-step explanation:
Find the slope of the line that is perpendicular to 2x - 5y = 7 :
m= 
Find the y - intercept of the function:
b = 
substitute m= and b = into y = mx + b :
y = 
+
y = 5x + 2y = 9
