ashiyaRfmodeonaxj ashiyaRfmodeonaxj

28-05-2017
Mathematics

contestada

Which ordered pair is the solution to the system of equations?

{x+y=4
{x−y=−6

(−2, 4)(−2, 4)

(2, 2)(2, 2)

(1, −7)(1, −7)

(−1, 5)

Respuesta :

ghanami ghanami

28-05-2017

hello :
{x+y=4....(1)
{x−y=−6....(2)
(1)+(2) : x+x+y-y = 4+(-6)
2x = -2
x= -2/2 = -1
subsct in (1) : -1 +y = 4
y = 5
the solution is : (−1, 5)

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