Straight line  $3x-9y-k=0$   passes through  A(2, 1) . Find the value of  $k$   .

Find the x-intercept and y-intercept of straight line   $2x+5y-10=0$  .

Straight lines  $L1:\ 3x-2y+7=0\ ,$  $L2:\ 2x+3y-4=0\$  and  $L3:\ 3x+2y+6=0$  are given. Which of the following must becorrect?
     I.   L1 // L2
     II.  L1  $\perp$   L2
     III. L2  $\perp$   L3

Where does the line  $y=3x+4$  cross the y-axis?

Write the slope-intercept form of the equation that has a slope of 4 and a y-intercept of −3.

What line goes through (1,4) and has gradient 2

Which line has gradient 2 and passes through the point (2,3)

Find the equation of a line with gradient 3 that passes through the point (2,4)

Find the equation of the straight line with the y-intercept of 5 passing through A(-1, 7).

Straight line  $-5x+ky-1=0$  passes through A(1, -2). Find the value of k.

Find the x-intercept of straight line  $3x-7y+21=0$  .

The y-intercept of straight line  $3x-6y+5k=0$   is -2. Find the value of k.

Challengling Question:
In the figure, the equation of the straight line is  $x+ay+b=0$  .
Which of the following must be correct?        

I.    a > 0        

II.   b < 0        

III.  ab > 0