Mohon bantuanyaaaaaaa

det A = 3(2) - 1(2) = 6 - 2 = 4
k = det (A^-1) = 1/(det A) = 1/4

Titik potong kedua garis
2x - y = 5
x + y = 1
------------ +
3x = 6 => x = 2
x + y = 1 => 2 + y = 1 => y = -1

Persamaan garis melalui P(2, -1) dan bergradien k = 1/4 => m = 1/4
y - y1 = m(x - x1)
y - (-1) = 1/4 (x - 2)
4(y + 1) = 1(x - 2)
4y + 4 = x - 2
-x + 4y + 6 = 0
x - 4y - 6 = 0