The equation of the line is x+2y+c=0 and its x-intercept is 2.
(a) Find the value of C
(b) Find the area bounded by the two axes and line
(c) Does the point (8, -3) lies on the line ?
(d) If A ( a, 2a) lies of the line, find the coordinates of A
Linear Equations in two unkno-
2012-02-08 6:15 am
回答 (1)
2012-02-08 6:32 am
✔ 最佳答案
(a) x-intercept is 2 i.e. (2,0)(2)+2(0)+c=0
c= -2
(b) Let (0,b) be the y-intercept.
i.e. 0+2b-2=0
b=1
Required area: (2x1)/2= 1
(c) Sub (8,-3) into the equation.
8+2(-3)-2=0
therefore, it lies on the equation.
(d) Sub A into the equation.
a+2(2a)-2=0
5a-2=0
a= 2/5
coordinate of A is (2/5,4/5)
參考: being a F.7
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