tolong nomor 4 beserta caranyaaa

y = 2x + 2
m = 2

Tegak lurus ---->
M1 x M2 = -1
2 x M2 = -1
M2 = -1/2

melalui titik (2, 1)
Y - Y1 = m(X - X1)
Y - 1 = -1/2(X - 2)
Y - 1 = -1/2 X + 1
y = -1/2 x + 2

semoga membantu...
th