(04.03 LC) Create an equivalent system of equations using the sum of the system and the first equation.
-3x + y = 12
x + 3y = 6

Step-by-step explanation:

first equation of new system would be the same as first one given:

-3x + y = 12

-3x+y + x+3y = -3x + x + y + 3y = -2x + 4y

12 + 6 = 18

so the second equation would be:  -2x + 4y = 18

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1  

f(x) has value 150 at x= 0

and 0 at x= 3

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