Question

Me Ajudem

a) x+y=9
x-y=5

b) 4x-y=8
x+y=7

c) 2x+3y=2
4x-9y=1

d) 2x+3y=2
4x-9y=1

Answer 1

a) x+y=9
x-y=5

2x=14
x=14/2
x=7
7+y=9
y=9-7
y=2

b) 4x-y=8
x+y=7

5x=15
x=15/5
x=3
3+y=7
y=7-3
y=4