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2 years ago

Whats the order pair of x,y for x-2y=-12 x 6y=20?

1 answer:

mote1985 [20]2 years ago

4 0

X-2y=-12
x+6y=20
we can cancel x's
multiply first equation by -1 and add to 2nd equation

-x+2y=12
<u>x+6y=20 +</u>
0x+8y=32

8y=32
divide both sides by 8
y=4

sub back

x-2y=-12
x-2(4)=-12
x-8=-12
add 12 both sides
x=-4

(x,y)
(-4,4)

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3 years ago

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Step-by-step explanation:

The explanation is shown below:-

the equation of system is:

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as x indicates the cost of electricity and y indicates the costs of natural gas.

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After deducting the equation (iii) and (iv) we will get

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