Verified Answer :

what I would do here is substitute "5y -87" for x in the  first ecquation, since the second equation is already in the form "x=..." so:


4(5y-87)+9y=29


getting rid of the bracket:

20y-348+9y=29


adding up:

29y=29+348

29y= 377

dividing by 29:

y=13


and now we can calculate x, which is 513-87=65-87=-22

so x=-22

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