Nomor Yang Digaris Bawahin aja kk”!

3). (c)

6). y = x – 8
x – y = 8 (b)

12). x = bilangan pertama
y = bilangan kedua
2x + 5 = -1
2x = -6
x = -3
x + y = 2
(-3) + y = 2
y = 5
x^2 + y^2 = (-3)^2 + 5^2 = 9 + 25 = 34 (c)

14). x = 2y
x + y = 15
(2y) + y = 15
3y = 15
y = 5

X + y = 15
x + (5) = 15
x = 10

x.y = 5.10 = 50 (d)

24). x = buku
y = pensil
3x + 5y = 6.500 | x2 | 6x + 10y = 13.000
2x + 4y = 4.800 | x3 | 6x + 12y = 14.400

2y = 1400
y = 700

3x + 5y = 6500
3x + 5(700) = 6500
3x + 3500 = 6500
3x = 3000
x = 1000 (c)

25). x + y = 84 | x2 | 2x + 2y = 168
4x + 2y = 220  | x1 | 4x + 2y = 220

2x = 52
x = 26 mobil
Substitusi
x + y = 84
(26) + y = 84
y = 58 motor

3.000x + 1.000y = 3.000(26) + 1.000(58)
=78.000 + 58.000
=136.000 (d)

Maaf kalau kurang jelas, dan maaf kalau salah. Semoga membantu ^^