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vladimir2022 [97]
3 years ago
5

The sum of a number and 3 times a second number is represented by a+3b= 39. The sum of half the of the first number and 1/3 of t

he second number is represented by 1/2a+1/3b=9. What is the first number a? What is the second number b?
Mathematics
1 answer:
d1i1m1o1n [39]3 years ago
5 0
If we multiply the second equation by 2 we get

a + 2/3b = 18 ............(3)
a + 3b = 39................(1) 
(1) - (3) gives:-
7/3 b = 21
b =  21 * 3/7 = 9 

plug b = 9 in equation (1):-

a + 3(9) = 39 

a = 39-27 = 12 

Answer:- a = 12 and b = 9.
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Hunter-Best [27]

Answer:

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Because you are solving the equation for y, you want to have y by itself on one side. The only way to do that in this problem is by subtracting the 7x on both sides.

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4 0
3 years ago
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elena-14-01-66 [18.8K]

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