Question

6x-5y=-9 4x+8y=13 por reduccion

Answer 1

6x - 5y = - 9
4x + 8y = 13

4x + 8y = 13
8y = 13 - 4x
y = (13 - 4x)/8

6x - 5y = - 9
6x - 5((13 - 4x)/8) = - 9
6x - (86 - 20x)/8 = - 9
(48x - 86 + 20x)/8 = - 9
68x - 86 = - 72
68x = 14
x = 7/34

y = (13 - 4x)/8
y = (13 - 4(7/34))/8
y = (13 - 28/34)/8
y = 414/34/8/1
y = 414/272
y = 207/136