2010年一月SAT数学题题是这样的:y=-2(x-2)^2+3In the xy-plane,line L passes through the point (4,-5) and the vertex of the parabola with the equation above.What is the slope of line

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2010年一月SAT数学题题是这样的:y=-2(x-2)^2+3In the xy-plane,line L passes through the point (4,-5) and the vertex of the parabola with the equation above.What is the slope of line
2010年一月SAT数学题
题是这样的:y=-2(x-2)^2+3
In the xy-plane,line L passes through the point (4,-5) and the vertex of the parabola with the equation above.What is the slope of line

2010年一月SAT数学题题是这样的:y=-2(x-2)^2+3In the xy-plane,line L passes through the point (4,-5) and the vertex of the parabola with the equation above.What is the slope of line
中文意思就是:直线L过抛物线y(2,3),L又过(4,-5),所以设L:y=kx+b联立-5=4k+b和3=2k+b得k=-4,b=11,即y=-4x+11.

  • -4

the vertex of the parabola with the equation above is (2,3)
k=(3-(-5))/(2-4)=-4