## Algebra 1: Common Core (15th Edition)

You have the sequence -1,3,7,11. The A(1) is -1. Find the common difference: 3-(-1)=4 7-3=4 11-7=4 Plug into recursive formula ($A^{n}$=$A^{n-1}$+d).The recursive formula is $A^{n}$=$A^{n-1}$+4 Plug into the explicit formula $a^{n}$=A(1)+(n-1)d: y=-1+(x-1)(4) y=-1+4x-4 y=4x-5 The recursive formula relates to the slope-intercept form because the common difference(4) is equal to the slope of the slope-intercept form.