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Q: What is the answer to 7 plus 3b equals 61?

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3b -2 =7 b+4

-7+3b = 4b-8 3b-4b = -8+7 -b = -1 b = 1

-2b + 7 -3b = 2 -2b +7 -3b +2b = 2 + 2b 7 -3b + 3b = 2 + 2b +3b 7-2 = 2-2 + 2b + 3b 5 = 5b 1 = b

5 + 10ac + 3b

5b plus 5-3b-7 is 2b-2.

7 + 4b + 3b + 6b + 5 =7 + 13b + 5 =12 + 13b

-45m + 68 = 84m - 61 39m = 7 m = 7/39

It is a linear equation in two unknown variables, a and b. It can be simplified (slightly) but cannot be solved becasue to solve with two unknowns you need two independent equations. Incidentally, a + 5 = (a - 7) + 12 = (3b + 2) +12 = 3b +14

It simplifies to: 3b+17

26 = 3b - 2 - 7b 28 = -4b b = -7

The equation cannot be solved as there are two unknowns. However it can be simplified and the two unknowns (a and b) expressed in terms of the second unknown. 1) Expressing a in terms of b 4a + 2 = 3b - 5 4a = 3b -7 if desired this could be stated as a = (3b - 7)/4 2) Expressing b in terms of a 3b - 5 = 4a + 2 3b = 4a + 7 if desired this could be stated as b = (4a + 7)/3

3b - 7b - 2 = 26 then , -2 - 4b = 26 then , 4b = 26 then you do , -4 / 26 which equals 7

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