3 Rajah 1 menunjukkan tiga garis lurus, AB, CD dan EF, dengan AB dan CD berserenjang dengan garis EF. Diagram 1 shows three straight lines, AB, CD and EF, where AB and CD are perpendicular to line EF. Kertas E D. Rajah 1/Diagram 1 Diberi persamaan garis lurus AB ialah 4x + 3y + 12 0 dan pintasan-x bagi garis lurus CD ialah 3. Given the equation of straight line AB is 4x + 3y + 12 = 0 and the x-intercept of the straight line CD is 3. (a) Cari kecerunan garis lurus AB. Find the gradient of the straight line AB. (b) Cari persamaan garis lurus CD. Find the equation of the straight line CD.

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