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let's do it[tex]1) p=-1\\ 2)y=-16\\ 3)x=5\\ 4)B=36[/tex]
christinann062
p-1=-2
add 1 to each side
p=-1

y+5=-11
subtract 5 from each side 
y=-16

20=4x
divide by 4 on each side 
x=5

b/-4=-9
multiply by -4 on each side 
b=36