If #4a+5b=21# and #5b-4c=17#, what is #a+c#?

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Answer 1 · 2016-08-15T02:50:27

#a + c = 1#

#5b = 17 + 4c#

#=>4a + 17 + 4c = 21#

#4a + 4c = 21 - 17#

#4a + 4c = 4#

#4(a + c) = 4#

#a + c = 4/4#

#a + c = 1#

Hopefully this helps!