Problema Solution
The difference of two numbers, a and b, is 21. The difference of 5 times a and two times b is 18. What are the values of a and b?
Answer provided by our tutors
a - b = 21
5a - 2b = 18
by solving the system of equations we find
a = - 8
b = - 29
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indeed
-8 - (-29) = 21
5*(-8) - 2(-29) = 18
the solution is a = -8 and b = -29.