Question

Me ajudem:
A)x+3y=19
3x+y=9


B)3x+5y=-22
X-y=-2

C)x+y=2
Y=3x

Answer 1

A) x+3y=19
3x+y=9 (-3)

x+3y=19
-9x-3y=-27

-8x=-8
x=1

1+3y=19
3y=18
y=6


B)3x+5y=-22
X-y=-2(5)

3x+5y=-22
5x-5y=-10

8x=-32
x=-4

-4-y=-2
y=-2



C)x+y=2
Y=3x

x+3x=2
4x=2

x=1/2

y=3/2