2+4z-18 change it so it's an equation 2+4z-18=0 then get 4z alone on one side by subtracting 4z from both sides 2-18=-4z -16= -4z divide both sides by -4
a negative divided by a negative becomes positive 4 =z plug it in 2+4(4)-18 4x4 is 16 2+16-18=0 0=0
the same can be done for the second one 2+k-8
make it 2+k-8=0
move the k to get it alone so subtract k from both sides
