First slide
Cartesian plane
Question

The line 3x + 2y = 24 meets the y-axis at A and the x-axis at B. The perpendicular bisector of AB meets the line through (0, -1) parallel to the x-axis at C. The area of triangle ABC is

Moderate
Solution

Line 3x + 2y = 24 meets the axes at, B(8, 0) and A(0, 12). The midpoint of AB is D(4, 6).
The equation of perpendicular bisector of AB is 2x-3y+10=0 ………..(1)
Now, the line through (0, -1) and parallel to the x-axis is y = -1.
The coordinates of C where line (1) meets .y= -1 are (-13/2,-1).
Now, the area of triangle ABC,

Δ=12012180113/211 =120128+132+1(8)=12[6(29)8]=91

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