Question

1. x + y = 5 dan y= x + 1. 2. 2x -3y = 11 dan 3x + y = 0. tolong dgn cara yaa caranya pakai metode subtitusi☺

Answer 1

No.1
x + y = 5
y = x + 1
-----------
x + y = 5
x - y = -1
----------- -
2y = 6
y = 6/2
y = 3

x + y = 5
x + 3 = 5
x = 5 - 3
x = 2


No.2
2x - 3y = 11
3x + y = 0 (×3)
--------------
2x - 3y = 11
9x + 3y = 0
-------------- +
11x = 11
x = 11/11
x = 1

3x + y = 0
3(1) + y = 0
3 + y = 0
y = 0 - 3
y = -3

maaf kalo salah