Q: 2a plus 5a plus 9a equals?

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2a-5

9a +8 -2a -3 -5a = 2a +5

2a+5

so 5a = -20 making a = -4

4a - 2.1 = 9a + 5.4 4a - 9a = 5.4 +2.1 -5a = 7.5 -a = 1.5 a = -1.5

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9a +8 -2a -3 -5a = 2a +5

9a +8 -2a -3 -5a = 2a +5

2a-5

9a +8 -2a -3 -5a = 2a +5

2a+5

a + 3a + 5a = 180 9a =180 a = 20

so 5a = -20 making a = -4

4a - 2.1 = 9a + 5.4 4a - 9a = 5.4 +2.1 -5a = 7.5 -a = 1.5 a = -1.5

Collect like terms: 9a -7a = 9 - 15, ie 2a = -6, so a = -3

9a + 1

9a + 3b - 11a - 4b = -2a -b

a + b + c = 180 b = 3a c = 5a Substituting the values of b and c into the first equation. a + 3a + 5a = 180 or 9a = 180 so that a = 20 then b = 3a = 3*20 = 60 and c = 5a = 5*20 = 100