Question

3x+4y=-17 dan x+2y=-7 dengan metode subtitusi

Answer 1

#1
3x + 4y =-17
3x = -17-4y

#2
x+2y=-7 (semua dikali 3 supaya hasil x jadi 3x)
3x + 6y = -21
-17 - 4y + 6y = -21
-17 + 2y = -21
2y = -21 + 17
2y = -4
y = -2

#3
x + 2y = -7
x + 2 . -2 = -7
x -4 = -7
x = -7 + 4
x = -3