Find the solution of 2x+2y=10 and x=5y+20

(15/2, -5/2)

Step-by-step explanation:

1. Sub x=5y+20 into 2x+2y=10 and simplify as shown below.

  2(5y+20)+2y=10

  10y+40+2y=10

  12y+40=10

  12y=-30

  y=-30/12

  y=-5/2

2. Sub in y=-5/2 into 2x+2y=10 to find x and simplify as shown below.

  2x+2(-5/2)=10  

  2x-5=10

  2x=15

  x=15/2

(f+g)(x) = 3^x+10x+4x-2

      =3^x +14x-2

choice b