3 years ago

What is the answer for x and y in 2x-3y=4 x+4y=-9

Mathematics

1 answer:

Juli2301 [7.4K]3 years ago

4 0

2x-3y=4
x+4y=-9/*(-2)

2x-3y=4
-2x-8y=18

-11y=22/:(-11)
y=-2

x+4*(-2)=-9
x-8=-9
x=-1

I hope this helped.

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Given that £440 is divided between David, Mark & Henry

Let "d" be the share of david

Let "m" be the share of mark

Let "h" be the share of henry

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Therefore,

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Substitute eqn 2 and eqn 3 in eqn 1

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