Question

Penyelesaian dari:
a.4x - 7 = 3 +3
b.3x + 4 / 2 = 2x -4
c.4x +3 > 12 + x
d. 1/2 (x - 2) < 1/4 (x - 3)

Answer 1

A. 4x - 7 = 3 + 3
4x - 7 + 7 = 3 + 3 + 7
4x = 13
4x/4 = 13/4
x = 3,25

b. 3x + 4 / 2 = 2x - 4
3x + 2 = 2x - 4
3x + 2 - 2 = 2x - 4 - 2
3x = 2x - 6 
3x - 2x = 2x - 2x - 6
x = 6

c. 4x + 3 > 12 + x
4x + 3 - 3 > 12 - 3 + x
4x > 9 + x
4x - x > 9 + x - x
3x > 9
3x/3 > 9/3
x > 3

d. 1/2 (x - 2) < 1/4 (x - 3)
4 x 1/2 (x - 2) < 4 x 1/4 (x - 3)
2 (x - 2) < 1 (x - 3)
2x - 2 < x - 3
2x - 2 + 2 < x - 3 + 2
2x < x - 1
2x + x < -1
3x < -1
3x/3 < -1/3
x < 0,33

Answer 2

   a. 4x-7 =3+3                                                  a.x = 3.25
<=>4x=3+3+7                                                   b.x = -6
<=>4x=13                                                         c.x > 3
<=>x=13 : 4=3.25                                              d.x < 1
 
 b.3x+4/2=2x-4
<=>3x-2x=-4-4/2
<=>x = - 6
  
 c.4x+3 > 12 + x
<=>4x-x > 12-3
<=>3x > 9
<=>x > 9 : 3
<=>x > 3
  
 d.1/2(x-2)<1/4(x-3)
<=> 4 x 1/2 (x-2) < 4 x 1/4 (x-3)
<=>2(x-2) < 1 (x-3)
<=>2x - 4 < x -3
<=>2x-x < -3+4
<=> x<1