问题1:给出以下方程的几何表示
(a)在笛卡尔平面上的数字线(b)上:
(i)x = 2
(ii)y + 3 = 0
(iii)y = 3
(iv)2x + 9 = 0
(v)3x – 5 = 0
解决方案:
(i)x = 2
等式在数字线上的表示:
笛卡尔平面上方程的表示:
(ii)y + 3 = 0
或y = -3
等式在数字线上的表示:
笛卡尔平面上方程的表示形式:
(iii)y = 3
等式在数字线上的表示:
笛卡尔平面上方程的表示:
(iv)2x + 9 = 0
或x = -9
2个
等式在数字线上的表示:
笛卡尔平面上方程的表示:
(v)3x – 5 = 0
或x = 5
3
等式在数字线上的表示:
笛卡尔平面上方程的表示:
问题2:将2x + 13 = 0的几何表示形式表示为
(i)一个变量
(ii)两个变数
解决方案:
2x + 13 = 0
(i) Isolate given equation in x
Subtract 13 from both the sides
2x + 13 – 13 = 0 – 13
2x = -13
Divide each side by 2
x = – 13 = -6.5
2
Which is an equation in one variable.
(ii) 2x + 13 = 0 can be written as 2x + 0y + 13 = 0
The representation of the solution on the Cartesian plane: A line parallel to y axis passing through the point (-13 , 0):
2
问题3:编写一条通过点(0,4)并平行于x轴的直线的方程式。
解决方案:
Here, x-coordinate is 0 and y-coordinate is 4, so equation of the line passing through the point (0, 4) is y = 4.
问题4:编写一条通过点(3,5)并平行于x轴的直线的方程。
解决方案:
Here x-coordinate = 3 and y-coordinate = 5
Since required line is parallel to x-axis, so equation of line is y = 5.
问题5:编写一条平行于y轴并经过点(-3,-7)的线的方程
解决方案:
Here x-coordinate = -3 and y-coordinate = -7
Since required line is parallel to y-axis, so equation of line is x = -3.