Question

1) . Persamaan linear berikut yang setara dengan persamaan -3x/2 + 2x/5 = 7(5+x) + 2x/5 adalah...

a. -17x + 70 = 0
b. -11x + 70 = 0
c. 17x + 70 = 0
d. 11x - 70 = 0

2). Jika 5x - 7 = 2x + 11 , Nilai x + 2 adalah

a. 5
b. 7
c. 8
d. 9


dibantu ya...

Answer 1

-3x/2 + 2x/5 = 7 (x + 5) + 2x/5
-15x + 4x / 10 = 7x + 35 +2x/5
-11x/10 = 35x + 2x/5 + 35
-11x/10 = 37x + 175/5
-55x = 370x + 1750
-55x - 370x = 1750
-425x = 1750
-17x = 70
-17x - 70 = 0 --> 17x + 70 = 0 (c)


2. 5x - 7 = 2x + 11
  5x-2x = 11 + 7
  3x = 18
 x = 18/3
 x = 6

x + 2 = 6 + 2
 x + 2 = 8 (c)