Question

Garis ax + by = -8 dan 4x - 3y = b, berpotongan di titik (-1,-3) nilai a+b =...
pake caranya ya tolong mau belajar buat uts

Answer 1

Subtitusikan nilai (-1, -3) ke semua persamaan, hasilnya
-a - 3b = -8
-4 + 9 = b
b = 5

-a - 3(5) = -8
-a - 15 = -8
-a = -8 + 15
-a = 7
-a = -7

a + b = -7 + 5 = -2

Answer 2

Ax - by = -8
4x - 3y = b
titik potongnya(-1,-3)

jika titik potongnya dimasukan ke persamaan
4x - 3y = b
4(-1) - 3(-3) = b    ---> b = 5

ax - by = -8
a(-1) - 5(-3) = -8    ---> a = 23

a + b = 23 + 5 = 28