Question

Método da adição 7x-3y=14 2x+5y=45

Answer 1

7x-3y=14 .(5)
2x+5y=45 .(3)

35x-15y=70
6x-15y=135

41x=205
×=205/41
x=5

7x-3y=14
7.5-3y=14
35-3y=14
-3y= 14-35
-3y=-21 .(-1)
3y= 21
y=21/3
y=3