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Solve the following system by any method. –8x – 8y = 0 –8x + 2y = –20 A. (2, 2) B. (0, –2) C. (–2, 2) D. (2, –2)
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May 27, 2018
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Solve the following system by any method. –8x – 8y = 0 –8x + 2y = –20
A. (2, 2) B. (0, –2) C. (–2, 2) D. (2, –2)
Mathematics
college
Prasanna Brabourame
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Prasanna Brabourame
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this one is simple since we already have the two x variables.equal. All we have to do is subtract the equations from one another to get the answer.
So i will subtract the left side by the other left side and the right side by the other right side
-8x - 8y -(-8x + 2y) = 0 -(-20)
distribute negative sign
-8x - 8y + 8x - 2y = 0 + 20
do the math
- 10y = 20
Y = -2
plug t into an equation
-8x -8 (-2) = 0
-8x + 16 = 0
-8x = -16
x = 2
answer (2, -2)
Adam Siemion
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May 31, 2018
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Adam Siemion
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