Question

100x+33y=21
70x-9y=4

Answer 1

(9)100x+33y= 21
(33)70x-9y= 4

900x+ 297y= 21
2.310x + 297y = 4
( Se anulan los valores de la variable Y)

900x = 21
2.310x = 4

3.210x= 25
3.210/25= x