Question

Determine a solução dos sistemas:
a) X + Y = 5
X - Y = 3

b) 2X - Y = 4
3X + Y = 1

Answer 1

A)

x+y=5

×=5-y

x-y=3

5-y-y=3

5-2y=3

5-3=2y

2=2y

2/2=y

1=y

x=5-y

x=5-1

x=4

S=(4,1)