If 4a + b = 2 and a – 3b = 7, what is the value of b?

i dont know how to solve this type of problem
in order of operations by

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1 Answer

From the second equation a=7+3b, so substitute for a in the first equation:

4(7+3b)+b=2, 28+12b+b=2, 28+13b=2, 13b=-26, b=-2.

(We can also work out a=7+3b=7-6=1, and we have a=1, b=-2.)

by Top Rated User (1.1m points)

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