Question

Tentuin himpunan spldv dgn menggunakan mtode grafikk
a). 2x + 3y = -1
x + 2y = -2


buatin yaahh grafik nyaa

Answer 1

• 2x + 3y = -1

» x = 0
3y = -1
y = -1/3 → (0,-1/3)

» y = 0
2x = -1
x = -1/2 → (-1/2 , 0)

• x+2y = -2

» y = 0
x = -2 → (-2,0)

» x = 0
2y = -2
y = -2/2
y = -1 → (0,-1)

ketika ditarik garis pd masing masing koordinat, maka kedua garis akan bertemu pd titik (4,-3)

-------------------------
*Dengan cara subtitusi

x + 2y = -2
x = -2 -2y....(1)

2x + 3y = -1
2(-2-2y) + 3y = -1
-4-4y+3y = -1
-y = 3
y = -3...(2)

x = -2-2y
x = -2-2(-3)
x = -2+6
x = 4...(3)

Hp → (x,y) → (4,-3) #Terbukti