Question

EXERCISE 3.3 H.M
Solve the following pair of linear equations by the substitution method.
(i) x+y= 14
x-y=4​

Answer 1

Answer:

x+y=14 (make y the subject)

-x -x

Equation

(1) y= 14-x

(2) x-y= 4

Replace y in eqauation (2) with (14-x):

x-y= 4

x-(14-x)= 4 (expand)

x-14+x= 4

2x-14= 4 (plus 14 both sides)

+14 +14

2x=18 (divide both sides by 2)

2 2

x= 9

1). (9)+y=14

-9 -9

y=14-9

y= 5

Prove answer

1). (9)+(5)= 14

2). (9)-(5)= 4

Explanation:

hope this helps