Question

Solve using Linear Combination

2e-3f+-9
e+3f=18

Will medal/fan for best correct answer

Answer 1

both -3f and +3f = 0

Answer 2

Because in both equations the 3f's have opposite signs, you can add the two equations, giving you\[2e+e = 18-9\]Then you solve for e.
After obtaining e, you plug it into any of the two equations then solve for f.

Answer 3

\[ 2e-3f=-9\\ e+3f=18\]

Answer 4

the f's cancel out. letting you solve for e.

Answer 5

therefore 2e+e=-9+18