Question

solve equation by substitation method x-y=7
x+y=13
​

Answer 1

Step-by-step explanation:

x-y = 7 => x = y+7

x+y = 13

=> y+7+y = 13

=> 2y = 13 -7 = 14

=> y = 14/2 = 7

x = y+7 = 7+7 = 14

Answer 2

Answer:

y=3

x=10

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