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3 years ago

7

4x + 9y = 29 x = 5y - 87

1 answer:

Sergio [31]3 years ago

8 0

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 5*13-87=65-87=-22

so x=-22

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