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Mnenie [13.5K]
3 years ago
15

Solve this equation using an algebraic method.

Mathematics
1 answer:
kupik [55]3 years ago
7 0
(x+4) (x-4) = 9 
(x^2 - 16) = 9
x^2 = 25 
x=5 & x = -5 
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Solnce55 [7]

Answer:

(x, y) = (-2, -3)

WORK:

2x + 4y = -16  =

-2x + 2y = -2  =

(^ the two’s cancel out) =

6y = -18  =

(^ you need to divide 6 on both sides to get just y) =

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(^ the six’s cancel out) =

y = -3  =

(^ now you have to plug this in to get x) =

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(^ you need to add 12 on both sides to get rid of it on the left side to add it to -16 on the right side) =

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