Question

-4x -y +14 com x=15 e y= -1
-5a +b -30 com a=3 e b=-7
-A -5b -16 com a=-2 e b=-5
a- 5b +6 com a=-1 e b=0
-7a - b + 28 com a=0 e b=-10

Answer 1

Oiee,

A)
-4x -y + 14 __ x =15, y = -1
-4 × 15 - (-1) + 14
- 60 - ( -1 ) + 14
- 60 + 1 + 14
- 60 + 15
-45

B)
-5a + b - 30 __ x = 3, b = -7
-5 × 3 + ( -7 ) - 30
-15 - 7 - 30
-22 -30
-52

C)
-a -5b -16 __ a= -2, b= -5
- ( -2 ) -5 × ( -5 ) -16
2 + 25 - 16
27 - 16
11

D)
-a -5b + 6 __ a = -1, b= 0
- ( -1 ) -5 × 0 + 6
1 + 0 + 6
7

E)
- 7a - b + 28__ a= 0, b = -10
-7 × 0 - ( -10 ) + 28
0 + 10 + 28
38