Question

{X+Y=12
{X-Y=2

{X+Y=18
{5x-Y=0

Answer 1

x + y = 12

x - y = 2

2x = 14

X = 14/2

X = 7


y = 12 - 7

y = 5



S = { 7 , 5 }


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x + y = 18

5x - y = 0


6x = 18

X = 18/6

X = 3



Y = 18 - 3

y = 15




S = { 3 , 15 }