Question

16 calcule o valor de x,y,e t
a)2×-8=8

b)2t+1=8

c)9x+5=4x

d)3x+1=19

Answer 1

a)2×-8=8
2x=8+8
2x=16
x=16/2
x=8

b)2t+1=8
2t=8-1
2t=7
t=7/2 ou t=3,5

c)9x+5=4x
9x-4x=-5
5x=-5
x=-5/5
x=-1

d)3x+1=19
3x=19-1
3x=18
x=18/3
x=6

Answer 2

a)
2× - 8 = 8
2x = 8 + 8
2x = 16
x = 16/2
x = 8
------------------------------------
b)
2t + 1 = 8
2t = 8 - 1
2t = 7
t = 7/2
-----------------------------------
c)
9x + 5 = 4x
9x - 4x = - 5
5x = - 5
x = - 5/5
x = - 1
------------------------------
d)
3x + 1 = 19
3x = 19 - 1
3x = 18
x = 18/3
x = 6