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-Cari kecerunan garis lurus
Formula
m= (y¹-y²) / ( x¹-x²)
m= ( -2-0 ) / ( 0-3 )
m= -2/-3
m= 2/3
atau
m= - ( pintasan-y / pintasan-x)
m= - ( -2/3 )
m= 2/3
-Kecerunan persamaan garis lurus k
Formula (sejajar)
m¹m²= -1
(2/3)(m²) = -1
m²= -3/2
-Persamaan garis lurus k
Formula
y-y¹ = m(x-x¹)
y - 0 = ( -3/2 )( x-3 )
y= -3/2x + 9/2
(y + 3/2x = 9/2) darab 2 untuk hilangkan pembawahnya
Maka , 2y + 3x = 9 (C)