Question

Tolong,, Uji Kompetensi No. 1 aja d - j,,, tolong yah, saya sama sekali tidak mengerti dengan materi ini

Answer 1

D.
12 + 3a = 5 + 2a
 3a - 2a = 5 - 12
          a = -7

e.
 3(x+1) = 2(x+4)
 3x + 3 = 2x + 8
3x - 2x = 8 - 3
         x = 5

f.
  5(y-1) = 4y
  5y - 5 = 4y
 5y - 4y = 5
          y = 5

g.
  4(3-2y) = 15 - 7y
   12 - 8y = 15 - 7y
 -8y + 7y = 15 - 12
           -y = 3
            y = -3

h.
3(2y-3) = 5(y-2)
   6y - 9 = 5y - 10
 6y - 5y = -10 + 9
          y = -1

i.
8 - 2(3-4y) = 7y - 1
  8 - 6 + 8y = 7y - 1
      8y - 7y = -1 - 8 + 6
               y = -3

j.
   5x + 7(3x+2) = 6(4x+1)
 5x + 21x + 14 = 24x + 6
         26x + 14 = 24x + 6
        26x - 24x = 6 - 14
                   2x = -8
                     x = -8/2
                     x = -4

Answer 2

D) 12 + 3a = 5 + 2a
12-5 = 2a - 3a
7 = -a
a = -7

e) 3 (x+1) = 2 (x+ 4)
3x + 3 = 2x + 8
3x-2x = 8-3
x = 5

f) 5(y-1) = 4y
5y - 5 = 4 y
5y - 4y = 5
y = 5

g) 4(3-2y)= 15-7y
12 - 8y = 15-7y
12 - 15 = 8y -7y
-3 = y

h) 3(2y-3) =5(y-2)
6y - 9 = 5y - 10
6y - 5y = -10 + 9
y = -1

i) 8-2(3-4y) = 7y-1
8 - 6 + 8y = 7y-1
2 + 8y = 7y-1
8y-7y = -1-2
y = -3

j) 5x + 7(3x+2) = 6(4x+1)
5x + 21x + 6 = 25x + 6
26x + 6 = 25x + 6
26x - 25x = 6-6
x = 0