Answer:
y=2x+5
Explanation:
first find the gradient which is change in y/ change in x
so gradient= (9--1)/(2--3) = 10/5 = 2
there's only one answer with a gradient of 2 which is a but if you wanted to find the intercept you would do this
y=2x + c
put one pair of coordinates into the equation (I've picked (2,9) but it doesn't matter which)
9=2*2 + c
9=4 + c
c = 5
therefore the equation must be y=2x + 5
hope that helps