find the value of a - 3b -5c, when a = 13b - 15, b = 3c + 4 and c = -1.
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a=13b-15
b=3c+4
c=-1
then
b=3(-1)+4
b=1
a=13(1)-15
a=-2
now
a-3b-5C
(-2)-3(1)-5(-1)
-2-3+5
0
b=3c+4
c=-1
then
b=3(-1)+4
b=1
a=13(1)-15
a=-2
now
a-3b-5C
(-2)-3(1)-5(-1)
-2-3+5
0
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