elimination -3x -5y= 14 and -3x -6y= 21

Solve each system by elimination.

-3x -5y= 14

-3x -6y= 21
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1 Answer

-3x - 5y = 14

-3x - 6y = 21

Divide the bottom one by 3: -x - 2y = 7

Multiply by -1: x + 2y = -7

Subtract 2y: x = -2y-7

Substitute: -3(-2y-7) - 5y = 14

6y - 5y + 21 = 14

y + 7 = 0

y = -7

Substitute back into x = -2y - 7: x = 14-7

x = -21 , y = 7
by

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