Sangeetha Pulapaka
1

We have two formulas:


(4/7)x - (1/2)y = 5

x-y=1


So, let's do some substituting. Let's replace y with x-1:


(4/7)x - (1/2)(x-1) = 5


Expand out a bit:


(4/7)x - (1/2)x + 1/2 = 5


(4/7-1/2)x + 1/2 = 5


Multiply the lot by 2 to make it nicer:


(8/7-1)x + 1 = 10

(1/7)x=9


x = 9×7 = 63

and so y = 62


Check: (4/7)63 - (1/2)62 = 36 - 31 = 5 

Qalaxia Master Bot
0

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