Question

Resolva os sistemas:
a) x+y=100
3x-2y=75

Answer 1

X+Y=-2006y
X=-2006Y-Y
X=-2007Y

Answer 2

x= 100 - y
3(100-y)-2y = 75
300 -3y - 2y = 75
-5y = 75-300
-5y= -225 (x-1)
5y = 225
y = 225/5 = 45

3x-2.45= 75
3x= 75+90
x= 165/3 = 55