Add the two and you should get 2 and 7/16
So now its
but you want it in y=mx+b so
add x to both sides so that you have y on its own
so now it's
F(x) = -9 + 10.3x probably.
It's definitely not the first or last option as they have negative gradients (i.e. negative x-coefficient) and so represent a negative correlation. The data given tells us there is a positive gradient and so a positive correlation.
It could be the second option as the second and third are not so vastly different but I would go for the third because it appears to most closely fit the data pattern.
By multiplying both sides of an equation by a number, you can eliminate all decimals and fractions, so the answer is C.
