Questions that need to be answered...
how to delete an entire line in the main i can only delete the numbers on the left side
Click that line and select Edit->Delete.
How to transpose an equation to make a specific pro numeral the subject?
As Astro491K said this question is not clear...
how to find the gradient of a line from an equation?
Example: y+4x=5.
Solve it for y:
solve(y+4x=5,y)You'll get {y=-4*x+5}. "-4" is the slope.
how to find the co-ordinates of the points on the curve knowing only the y value and equation.
Example: Find the value(s) of x where y=2 in the following equation: y=x^2
Answer:
solve(y=x^2)|y=2You'll get {x=-sqrt(2),x=sqrt(2)}.
how to find the equation of the line joining two points.
You can define a function to do it:
define eqline(px1,py1,px2,py2)=((py2-py1)/(px2-px1))*(x-px1)+py1Example: Find the equation of line joining two points (1,5) and (2,3):
eqLine(1,5,2,3)You'll get -2*(x-1)+5.
This is it. They're really easy to do if you take time and read the manual.