1. Tentukan HP dari Sistem Persamaan Linear dengan metode subsitusi : a. x - 2y = -12 -x + y = 5 b. 3a + 2b = 1 a + b = -2 2. Tentukan HP dari persamaan berikut dengan metode grafik : a. x - y = 7 -> x, y ∈ C b. 2x + y = 4 2x - 3y = 12
katherineputri
A. x-2y = -12. | ×-1 -x+ y = 5. | ×1 ______________ -x+2y = -12 -x+y = 5 ______________ - y = -17
-x + y = 5 -x -17 = 5 -x. = 5 + 17 x = - 22
x = -17 y = -22
b. 3a + 2b = 1 | ×1 a + b = -2. | ×3 _____________ 3a + 2b = 1 3a + 3b = -6 ______________ - - b = 7 b = -7
ardilalukitasar
Y. =x+5 x-2(x+5)=12 x-2x+10=12 -x. =-12-10 -x. =-22 y. =-22+5 y. = -17 a. =-b-2 3(-b-2)+2b. =1 -3b-6+2b=1 -3b+2b. =1+6 -b. =7 a. =7-2 a=5 Hp ny tgl dgbng hsl yg pprtm dn kda j y
x-2y = -12. | ×-1
-x+ y = 5. | ×1
______________
-x+2y = -12
-x+y = 5
______________ -
y = -17
-x + y = 5
-x -17 = 5
-x. = 5 + 17
x = - 22
x = -17
y = -22
b.
3a + 2b = 1 | ×1
a + b = -2. | ×3
_____________
3a + 2b = 1
3a + 3b = -6
______________ -
- b = 7
b = -7
3a + 2b = 1
3a + 2.-7 = 1
3a -14 = 1
3a = 1 + 14
a = 15 / 3 = 5
a= -7
b = 5
hope its help:)