Which system of equations has a solution of approximately (-0.4,1.1)? a. x+3y=3 and 2x-y=-2 b.x-3y=-3 and 2x+y=2 c. x-3y=-3 and 2x-y=-2 d. x+3y=3 and 2x+y=2

Step-by-step explanation:

Solve each equation individually, using substitution or elimination.

A. x + 3y = 3

   2x - y = -2

Substitute:

2(3-3y) - y = -2

6-6y-y = -2

6-7y = -2

y = 8/7

plug it back in to the first equation:

x + 24/7 = 3

x = -0.4285, approximately, and since this rounds to -0.4 and 8/7 approximately equals 1.1,

A is your answer.

f=9

Step-by-step explanation:

Subtract 4f from 6f to get 6 by itself. (2f-12=6) Then add 12 to 6 to get 2f by itself. (2f=18) Then divide 2 from 18 to get 9.