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
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