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I n Ed help with 12 and13

I n Ed help with 12 and13-example-1
User Rakesh KR
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1 Answer

7 votes
7 votes

12)

3a + 5 = 2a - 6

3a = 2a - 11

a= - 11

13)

a - b = 9

a + b = 55

rewrite the second equation

a = 55 - b

substitute this new equation into the first equation

(55 - b) - b =9

55 - 2b = 9

-2b = -46

b = 23

then solve for a

a - (23) = 9

a = 32

User Shobi
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