math

heather:

x's numbers are -2,1,4,6,11
y's numbers are 1,7,13,17,27

y(x) = 2*x+5

(to find this equation, draw the coordinates on paper (x, y); (-2, 1); (1, 7)...)

test:
y(-2) = 2*-2+5=1
y(1)= 2*1+5=7
y(4)=2*4+5=13
y(6)=2*6+5=17
y(11)=2*11+5=27