The formula for arithmetic sequence is given by: an=a+(n-1)d where: an=nth term a=first term n=number of terms thus our first term will be: a1=8 a2=8+(2-1)(-6)=2 a3=8+(3-1)(-6)=-4 a4=8+(4-1)(-6)=-10 a5=8+(5-1)(-6)=-16 a5=-16 thus the sequence will be: 8,2,-4,-10,-16...
Bring like terms together (REMEMBER CHANGE THE SIGN WHEN MOVING ACROSS THE EQUAL SIGN i.e. - becomes + and + becomes -) 4x - 2x = 7 - 3 2x = 4 divide both sides by 2 x = 2
