1. solve the following pair of simultaneous equations.
6f + e = 23
2e - f = 7
2. solve the question 1 above graphically, i. e using straight line graphs. show all relevant points

From equation 1 e=23-6f
sub 1 into 2. 2(23-6f)-f=7
46-12f-f=7
46-7-12f-f=0
39-11f=0
39=11f
then u divide both side by 11
therefore f=3.55
subtitude f in 1
6(3.55)+e=23
21.3+e=23
e=23-21.3
e=1.7

The correct answer would be "convenience"