过点p(—3,0)且斜率为2的直线方程是
问题描述:
过点p(—3,0)且斜率为2的直线方程是
答
(1)2(4x-0.5)
=2*4x-2*0.5
=8x-1
(2)-3(1-1/6*x)
=-3*1+3*1/6x
=-3+x/2
(3)-x+(2x-2)-(3x+5)
=-x+2x-2-3x-5
=-2x-7
(4) 3a^2+a^2-(2a^2-2a)+(3a-a^2)
=3a^2+a^2-2a^2+2a+3a-a^2
=a^2+5a
答
点斜式
y-0=2[x-(-3)]
2x-y+6=0