Question

2x+3y=13 5x-2y=4 entonces x+y es

Answer 1

2x + 3y = 13
x = (13 - 3y)/2

5x - 2y = 4
5((13 - 3y)/2) - 2y = 4
(65 - 15y)/2 - 2y = 4
(65 - 15y - 4y)/2 = 4
65 - 15y - 4y = 8
57 = 19y
3 = y

2x + 3y = 13
2x + 3(3) = 13
2x + 9 = 13
2x = 4
x = 2