I think you have to figure out the gradient, so you take the 2 points and put it into the equation change in y divided by change in x aka y2-y1/x2-x1
so for question 3: y2=4 and y1=3 (taken from the first and second coordinates) x2=3 and y1=7 put these values jnto the equation 4-3/3-7 = 1/-4 (can be written as negative 1/4)
for question 4 its the same thing: y2=9 and y1=5 x2=4 and x1=2 put into equation 9-5/4-2 = 4/2
hope this helps, im also hoping your teacher already has taught this because i didnt go into detail of where the equation came from, if not ask me and ill gladly help X
The general formula for the slope between two points<span> is </span>slope<span> = . To </span>find<span> the vertical and horizontal distances </span>between<span> the </span>two points<span>, sometimes this can be seen by looking at the graph, but the vertical and horizontal distances </span>between two points<span> can always be found by subtracting the coordinates of the </span>two points<span>. I've attatched a visual example for you; </span> if you follow this formula you will end up with the following results :
It is a linear function so you find the slope by doing y2-y1/x2-x1 and you find the slope to be 1/2. You can then setup an equation using it and graph it to find the next value.