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12-02-2018
Mathematics

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Solve the system of linear equations. separate the x- and y- values with a coma. 4x+5y=1 -6x+3y=9

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12-02-2018

4x+5y=1 ------- (1)
-6x+3y=9 -------(2)

(1) x 3 :
12x + 15y = 3 ------- (1a)
(2) x 2:
-12x + 6y = 18 ------ (2a)

(1a) + (2a):
15y + 6y = 3 + 18
21y = 21
y = 1 ------- sub into (1)
4x + 5(1) = 1
4x + 5 = 1
4x = 1 - 5
4x = -4
x = -1

Ans: x = -1, y = 1

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