Which of these strategies would eliminate a variable in the system of equations?
8x + 5y = -7
-7+ 6y = -4

choose all answers that apply:

a. multiply the top equation by 6, multiply the bottom equation by -5, then add the equations.

b. multiply the top equation by 7. then add the equations.

c. multiply the bottom equation by 8, then add the equations.

A.

Step-by-step explanation:

multiply the to equation by 6, multiply the bottom equation by -5 (you will get +30y and -30y to eliminate each other)then add equations (you will have +48x and +45x which will be = -42 + 20)

$450 is the answer.

step-by-step explanation:

30% of 450 = 135

450-135=315

f(x) has value 150 at x= 0

and 0 at x= 3

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