Question

What is the answer for a, b? And explain why please

Answer 1

Ok, I think you mean:

y = mx+c

and its simple.

1. This equation is a straight line equation (so if you are asked to draw that you know it will be a straight line)

2. the m stands for the gradient which just means how "steep" the line is. this can be found by doing y2-y1/x2-x1

3. The c is the y-axis intercept is where the line crosses the y-axis (so you just look at the graph and look for the point where the line crosses the y-axis)

If you are given a straight line and is asked to give its equation then you know that it will be y=mx+c

then you find the value for m by doing y2-y1/x2-x1
the y's and x's here are found by taking any two points from the graph and looking at the "co-ordinates" this means you look for where on the y-axis the point is and where on the x-axis the point is and then just substitute that into the equation to find m.

to find c you just look at where the line crosses the y-axis..


now I know I made this slightly complicated, so just look at this website which is very good and simple and will show you what and how it works: