1.

Find the value of X if x -y=9,x +y=5​

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Answer:

Hi your answer is as follows

Step-by-step explanation:

We can SOLVE the above by elimination method:

x-y = 9     ----------(1)

x+y  =5    ---------(2)

cancelling y        ----------(adding 1 and 2)

2X = 14

x = 7

so y = -2

ALTER METHOD:(substitution)

x-y = 9

x = 9+y ----(3)

subs 3 in 1 we GET,

9+y+y = 5

2y + 9 = 5

2y = -4

y = -2 ---------(4)

subs 4 in 2 we get,

x - 2 = 5

x = 5+2

x = 7

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