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Ninth grade new observation mathematics answer mathematics
Solution: According to the topic, get A (1, 0) B (3,0 0) C (0 0,3) KAC = kpq =-3.

∠ CPQ = 135 is the included angle between PC and PQ, then (-3-KPC)/(1-3 KPC) =-1.

The solution is kAC=- 1/2, and the equation of straight line AC is x+2y-6=0.

Simultaneous y=x? -4x+3 and x+2y-6=0, and the intersection point P(7/2, 5/4)[ the other intersection point is C].

The analytical formula y=-3x+47/4 of the straight line PQ is obtained by the point inclination formula.

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