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Garis melalui dua titik yaitu ( 0,-2 ) dan ( 2,4 )
m = ( 4 - (-2) ) : ( 2 - 0 )
m = 6 : 2
m = 3
y = 3x - ( 3 . 2 - 4 )
y = 3x - 2 ⇒ Jawaban D
Nomor 17
3x - 2y = 27 | 5 | 15x - 10y = 135
5x + 3y = 26 | 3 | 15x - 9y = 78
y = -3
3x - 2y = 27
3x - 2(-3) = 27
3x + 6 = 27
3x = 27 - 6
x = 21/3
x = 7
y - 2y = 7 - 2(-3)
= 7 + 6
= 13 ⇒ Jawaban D
Nomor 16
(y-y1)/(y2-y1) = (x-x1)/x2-x1)
(y-1)/(3-1) = (x+2)/(4+2)
(y-1)/2 = (x+2)/6
6(y-1) = 2(x+2)
6y - 6 = 2x + 4
-2x + 6y - 6 - 4 = 0
-2x + 6y - 10 = 0
-x + 3y - 5 = 0 ⇒ Jawaban tidak ada
Nomor 17
4x + 3y = 13500 | 2 | 8x - 6y = 27000
3x + 2y = 9750 | 3 | 9x + 6y = 29250
-x = -2250
x = 2250
3x + 2y = 9750
3(2250) + 2y = 9750
6750 + 2y = 9750
2y = 9750 - 6750
y = 3000/2
y = 1500
2x + 3y = 2(2250) + 3(1500)
= 4500 + 4500
= 9000 ⇒ Jawaban D