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Q: What is 6a - 5b equals 9 using addition method?

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Add the equations: 4a + 4a - 5b + 5b = 7 + 17 ie 8a = 24 a = 3, so b = 1

15 = 5b

(4, 3)

If: 5b = 30 Then: b = 6

The answer is 7.

(2a - 5b)(5a - b)

5b = 21 + 4b 5b - 4b = 21 + 4b - 4b b = 21

5b + 3 = 10 - 3 - 3 5b = 7 5b/5 7/5 b= 1.5 There you go !

10a - 5b = 25 So 5b = 10a - 25 and hence b = 2a - 5

4a - 5b = 74a +5b = 17From the first equation:4a = 7 + 5bsubstitute this value in the second equation:7 + 5b + 5b = 177 + 10b = 1710b = 10b = 1Now,solve for a :4a - 5(1) = 74a = 7 + 54a = 12a = 3

7b + 16 = 5b + 247b - 5b = 24 - 162b = 8b = 4

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