Question

alguem resolve pfv to precisando urgenteeeee

Answer 1

5)
a)x+y= 12
x-y= 2
2x= 14
x= 14/2
x= 7
7+y= 12
y= 12-7
y= 5
b) x= 2y
x+y= 12
2y+y= 12
3y= 12
y= 12/3
y= 4
x=2.4
x= 8
c)x+y= 5
x+3y= 11
x= 5-y
5-y+3y=11
-y+3y= 11-5
2y= 6
y= 6/2
y= 3
x= 5-3
x= 2
d)y= 3x
x+y = -6
x+3x= -6
4x= -6
x= -6/4
x= -3/2
-3/2+y= -6
y= -6+3/2
y= -9/2
6)
a) 5x+y= 1
3x+4y= 13
y= 1-5x
3x+4(1-5x)=13
3x+4-20x=13
3x-20x= 13-4
-17x= 9
x= -9/17
y= 1-5(-9/17)
y= 62/17
espero ter ajudado