1/3x + y = 4....subtract 1/3x from both sides
y = -1/3x + 4 <===
Ravi swims 9 kilometers a week
1 kilometers (km) = 1,000 meters (m)
9000 m / 1000 = km
to simplify : 9/1 = 9
9,000 meters = 9 kilometers
Answer:
The inverse f-1(x) = ( x + 10)/2.
Step-by-step explanation:
f(x) = 2x - 10
Find x in terms of f(x):
2x = f(x) + 10
x = (f(x) + 10))/ 2
Replace x by the inverse f-1(x) and f(x) by x:
f-1(x) = (x + 10)/2.
Δ = 1 + 4*20 = 81
x' = (-1 + 9)/2 = 4
x'' = (-1 - 9)/2 = -5
4² + 4 - 20 = 0
(-5)² - 5 - 20 = 0
Ok !
