if 12x+13y=62 and 13x+12y =63then the value of (x+y) is
a) -5 b)1 c) 5 d)1
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Answer:
5
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Step-by-step explanation:
12x+13y=62
62-12x=13y
(62-12x) /13=y
13x+12y=63
13x+12(62-12x) /13
=(169x+744-144x) /13=63
=25x+744=13×63
= 25x+744=819
25x=819-744=75
25x=75
x=3
12x+13y=62
36+13y=62
62-36=13y
26=13y
y=2
x+y=3+2
=5
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