Question

Use the method of substitution to solve each other of the pair of simultaneous equations:  

 (a) x + y = 15                    x - y = 3

 (b) x + y = 0                      x - y = 2

 (c) 2x - y = 3                   4x + y = 3

(d) 2x - 3y = 2                  x + 2y = 8

 (e) x + y = 7                  2x - 3y = 9

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Answer 1

Step-by-step explanation:

a)x+y=15

then x=15-y

and given x-y=3

so substituting the value of x we get

15-y-y=3

-2y=-12

y=6

b)x+y=0

x=-y

so given x-y=2

substituting value of x we get

-y-y=2

-2y=2

y=-1

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