QQ.If 11x +13y = 7.4 and 13x +11y = 7.0 then 10(x + y) is
a) 0.6
b) 1.2
d) 12.0
c) 6.0
Answers
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Step-by-step explanation:
SOLUTION
TO CHOOSE THE CORRECT OPTION
If 11x + 13y =7.4 and 13x+11y = 7.0 then 10(x+y) is
a. 0.6
b. 1.2
c. 6.0
d. 12.0
EVALUATION
Here the given system of equations are
11x + 13y =7.4 - - - - - (1)
13x+11y = 7.0 - - - - - -(2)
On addition we get
24x + 24y = 14.4
⇒24( x + y ) = 14.4
⇒( x + y ) = 0.6
⇒ 10( x + y ) = 10 × 0.6
⇒ 10( x + y ) = 6.0
FINAL ANSWER
Hence the correct option is c. 6.0
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Learn more from Brainly :-
1.1. Find a number whose 6 1/4% is 12
https://brainly.in/question/24604085
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