buatlah persamaan garis dibaha ini ! 1) gradien = 7 , melalui titik (1,2) 2) gradien = 2 , melalui titik (2,4) 3) gradien = 5 , melalui titik (4,2) 4) gradien =

Jawab : 

1) m = 7 , melalui titik (1,2)

[tex]y - y_{1} = m(x - x_{1} ) [/tex]
y - 2 = 7(x - 1)
y - 2 = 7x - 7 
y = 7x - 7 + 2
y = 7x - 5

2) m = 2 , melaui titik (2,4)

[tex]y - y_{1} = m(x - x_{1} )[/tex]
y - 4 = 2(x - 2)
y - 4 = 2x - 4
y = 2x - 4 + 4
y = 2x

3) m  = 5 , melalui titik (4,2)

[tex]y - y_{1} = m(x - x_{1} )[/tex]
y - 2 = 5(x - 4)
y - 2 = 5x - 20
y = 5x - 20 + 2
y = 5x -18

4) m = 8 , melalui titik (3,1)

[tex]y - y_{1} = m(x - x_{1} )[/tex]
y - 1 = 8(x - 3)
y - 1 = 8x - 24
y = 8x - 24 + 1
y = 8x - 23