Can someone check my answers? The amount of money in Alexander’s account is, = 4000 − 70, where is the amount in dollars and is the time in weeks.

a) Which variable is independent and which is dependent?

Dependent is -70x and independent is 4000

b) In which week will there be $1701 in the account?



y=4000-70(x)

1701=4000-70(x)

-70x=1701-4000

-70x= -2299

x=-2299/-70

x=2299/70

x=32.843

x=33

c) How much will the amount in Alexander’s account change if the time increases by 15 weeks?



y=4000-70(x)

y=4000-70(15)

y=2950

yes you are correct

Step-by-step explanation:

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)