Question

Resolver las ecuaciones: 78 8,9,10,11

a. 8x – 4 + 3x = 7x + x +14 =

b. 8x + 9 – 12x = 4x – 13 – 5x =

c. 5y + 6y – 81 = 7y + 102 + 65y =

d. 16 + 7x – 5 + x = 11x – 3 – x =

Answer 1

a) 11x-4=8x+14
3x=18
x=6
b) -4x+9=-x-13
22=3x
22/3=x
c) 11y-81=72y+102
-183=61y
y=-3
d) 11+8x=10x-3
14=2x
x=7

Answer 2

a. 8x – 4 + 3x = 7x + x +14 =
11x - 4 = 8x + 14
11x - 8x = 14 + 4
3x = 18
x = 18/3
x = 6



b. 8x + 9 – 12x = 4x – 13 – 5x =
- 4x + 9 = - x - 13
- 4x + x = - 13 - 9
- 3x = - 22
x = -22/-3
x = 22/3



c. 5y + 6y – 81 = 7y + 102 + 65y =
11y - 81 = 72y + 102
11y - 72y = 102 + 81
- 61y = 183
y = 183/-61
y = - 3



d. 16 + 7x – 5 + x = 11x – 3 – x =
8x + 11 = 10x - 3
8x - 10x = - 3 - 11
- 2x = - 14
x = - 14/-2
x = 7