SOLUTION: Solve using the elimination method. Use a graphing calculator to check your answers. 8x-5y=77 -6x-3y=-51 The answer they got was (9,-1) How did they get this?

Question 929411: Solve using the elimination method. Use a graphing calculator to check your answers.
8x-5y=77
-6x-3y=-51

The answer they got was (9,-1) How did they get this?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
8x-5y=77
-6x-3y=-51
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put the system of linear equations into standard form
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8x-5y=77
-6x-3y=-51
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copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = 9
y = -1
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now by elimination:
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3(8x - 5y = 77)
4(-6x - 3y = -51)
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24x - 15y = 231
-24x - 12y = -204
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add the two equations:
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-27y = 27
y = 27/-27
y = -1
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8x - 5y = 77
8x - 5(-1) = 77
8x + 5 = 77
8x = 77 - 5
x = 72/8
x = 9
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solution by elimination:
x = 9
y = -1
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Solve quadratic equations, quadratic formula:
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Solve systems of linear equations up to 6-equations 6-variables:
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