Question

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
​

Answer 1

Answer:

(a) 0.6

Step-by-step explanation:

hope it helps you

Answer 2

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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