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Solve the system by using the addition method. 2/3x + 1/4y= -262/5 + 2/3y = -28(x,y) = (_, _)

Solve the system by using the addition method. 2/3x + 1/4y= -262/5 + 2/3y = -28(x-example-1
User Pfa
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1 Answer

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2/3x + 1/4y = -26 (a)

+

2/5x + 2/3y = -28 (b)

____________

Multiply (a) by -3/5 , then add

-2/5x - 3/20 = 78/5

+

2/5x + 2/3y = -28 (b)

______________

31/60y = -62/5

y = -62/5 * 60/31

y= -24

Replace y=-24 on any equation and solve for x

2/3x + 1/4 (-24) = -26

2/3x -6 = -26

2/3x = -26+6

2/3x = -20

x = -20 * 3/2

x = -30

(x,y) = (-30,-24)

User Izhaki
by
6.9k points
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