Question

A. 4 (3-2y) = 15-7y
B. 3 (2y-3) = 5 (y-2)
C. 8-2 (3-4y) = 7y-1
D. 5 x + 7 (3x+2) = 6 (4x+1)
Hasil dicari dengan cara kedua ruas ditambah atay dikurangi dengan bilangan yang sama.
Makasih.

Answer 1

A. 12-8y = 15-7y
     -8y+7y = 15-12
     -y = 3
     y = -3
B. 6y - 9 = 5y - 10
    6y - 5y = -10 + 9
    y = -1
C. 8 - (6 - 8y) = 7y - 1
    2 + 8y = 7y - 1
    8y - 7y = -1 - 2
    y = -3
D. 5x + 21x + 14 = 24x + 6
    26x - 24x = 6 - 14
    2x = -8
    x = -4

Answer 2

A,
12-8y = 15-7y | +(8x-12)
0=y+3            | -3
-3 = y
b.
6y-9 = 5y-10 | -(5y-10)
y+1 = 0        | -1
y = -1
c.
8-6+8y=7y-1
2+8y=7y-1    | -(7y-1)
y+3 = 0         | -3
y = -3
d.
5x+21x+14 = 24x+6
26x+14=24x+6         | -(24x+6)
2x+8 = 0                  | - 6
2x = -8                     | :2
x = -4