Solve this system of equations
plz help

(10,30)

x=10

y=30

Step-by-step explanation:

Looking at the first one we know exactly what y is equal to in terms of x so whenever we need a y in the second equation we can just replace it with 3x which means we have

-.5x+35=3x

Solve for x and get

35=3.5x

10=x

We can then plug this x value into the first equation and solve for y

y=10*3

y=30

our answer is therefore (10,30)

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50

it’s the first one your welcome