Question

Me ajudem e para amanhã

Answer 1

5) y = 1 - x
2x + (1 - x) = 5
2x + 1 - x = 5
x = 5-1
x=4
y = 1-x
y = 1-4
y = -3

6) x = 4+y
4(4 + y)+2y = 4
16 + 4y + 2y = 4
6y = 4 -16
y = -12 / 6
y = - 2
x = 4 + y
x =  4 -2
x = 2

7) 2x = 5 - 5y
x = (5-5y) / 2
3 [(5 - 5y) / 2] + 2y = 2
(15 -15y) / 2 + 2y = 2
15 - 15y + 4y = 4
- 11y = -15 + 4
y = -11 / (-11)
y = 1
x = [(5 - 5 (1)) / 2
x = 0

8) x = -4y
3(-4y) + 2y =5
-12y + 2y = 5
-10y = 5 .(-1)
y = -5 / 10
y = - 1 / 2
x = -4(-1/2)
x = 4/2 
x = 2

9) x = 1 + y
1 + y + y = 3
2y = 3 - 1
y = 2 / 2 
y = 1

x = 1 + y 
x = 1 + 1 
x = 2