Question

Hitunglah x dan y dari:
a. 2x + y = 5
x - y = 11
b. x - y = 6
x + y = 10

Answer 1

A. 2x + y = 5
x = 11 + y
Jadi : 2(11 + y) + y = 5
22 + 2y + y = 5
22 + 3y = 5
3y = 5-22
3y = -17
y = -17/3 maka x = 11 + (-17/3)
x = 16/3
b. x-y = 6
x = 10-y

(10-y) - y = 6
10 - 2y = 6
2y = 4
y = 2 maka x = 8