Question

Solve : 6 X + 7 Y = 71 ; 5 X + 2 Y = 40​

Answer 1

Answer:

Solution,

Given,

6x+7y=71. (i)

5x+2y= 40. (ii)

now solving (i) and(ii),

multiply (i) by 2 and (ii) by 7 then subtract (i) from (ii).

35x+14y=280

-(12x+14y=142)

35x+14y=280

-12x-14y=-142

23x=138

x=138/23

x=6

now put the value of x in (i)

6×6+7y=71

7y=71-36

y=35/7

y=5

Therefore; x=6

y=5;Answers;