danayavaughan danayavaughan

29-08-2016
Mathematics

contestada

how to solve
x+3y=-7
-x+2y=8

Respuesta :

texaschic101 texaschic101

29-08-2016

x + 3y = -7
-x + 2y = 8
--------------add
5y = 1
y = 1/5

x + 3y = -7
x + 3(1/5) = -7
x + 3/5 = -7
x = -7 - 3/5
x = - 35/5 - 3/5
x = - 38/5

check...
-x + 2y = 8
-(-38/5) + 2(1/5) = 8
38/5 + 2/5 = 8
40/5 = 8
8 = 8 (correct)

solution is : (-38/5, 1/5)

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