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(ii) 2x - y - 1 = 0 .............m = 2
(iii) 2y + x = 5 ............ m = - 1/2
(iv) 2y = - x + 6 ............. m = - 1/2
syarat sejajar mempunyai gradien yang sama
(iii) dan (iv) mempunyai gradien yang sama yaitu - 1/2 jadi,keduanya sejajar
jawaban D
no.15)...- 3x + y - 2 = 0 ------+ m1 = 3
syarat sejajar m1 = m2 = 3
melalui (3 , -1)
y - b = m(x - a)
y - -1 = 3(x - 3)
y + 1 = 3x - 9
-3x + y + 1 + 9 = 0
-3x + y + 10 = 0 kalikan -
3x - y - 10 = 0 jawaban D
no.16)..5x - 2y = -1
x - 2y = 3
---------------- -
4x = -4
x = - 1
x - 2y = 3
-1 - 2y = 3
-2y = 3 + 1
- 2y = 4
y = - 2
2x - 5y = 2.(-1) - 5.(-2)
= - 2 + 10
= 8 jawaban A