Answers

2014-10-31T21:50:56+08:00
X+y = 53
x-y =  15                / by elimination
2y = 38
y =19
x+19=53
x=  34

x+y =53
x= 53-y
53-y -y =15    /by substituition
-2y = -38
y =19
x+19 = 53
x = 34




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