a. 3x + 4x – 19 = 0
b. 3y + 4x – 37 = 0
c. 7y + 4x – 33 = 0
d. 7y + 3x – 37 = 0
Persamaan garis yang melalui titik (-4, 7) dan titik (10, -1) adalah
Misal : (-4,7) = titik 1 dan (10,-1) = titik 2
Maka : x1 = -4 y1 = 7
x2 = 10 y2 = -1
y – y1 = x – x1
y2 – y1 x2 – x1
y – 7 = x – (-4)
-1 – 7 10 – (-4)
y-7 = x+4
-1 – 7 10 + 4
y-7 = x+4
-8 14
14(y-7) = -8(x+4)
14y – 98 = -8x – 32
14y + 8x = 98 – 32
14y + 8x = 66 | kedua ruas di bagi 2
7y + 4x = 33
7y + 4x – 33 = 0
Jawaban C. 7y + 4x – 33 = 0
Sory klo salah
Y-y1/y2-y1 = x – x1/ x2 – x1
y – 7 / -1 – 7 = x + 4/10 + 4
y-7 / -8 = x + 4 / 14
14(y-7) = -8(x + 4)
14y – 98 = -8x – 31
14y = -8x -31 + 98
14y = -8x +67
7y = -4x + 33
b.7y + 4x – 33 = 0