Question

Determine os valores de A,B e C:

6X+3(4-X)=2X+15

6X+A-3X=2X+15

BX=2X+C

X=C

Answer 1

6X+3(4-X)=2X+15
6X + 12 - 3X = 2X + 15
3X - 2X = 15 -12
          X = 3
==========================
6X+A-3X=2X+15    ------------(substituindo X = 3)
6.3 +A - 3.3 = 2.3 + 15
18 + A - 9 = 6 + 15
 9 + A = 21 --> A = 21-9 --> A = 12
====================================
X = C ---> C = 3
=====================================

BX=2X+C
B . 3 = 2.3 + 3
3B = 6 + 3
3B = 9 ---> B = 9/3 ----> B = 3