Let us take the first equation first
2a + b = 5
Then
b = 5 - 2a
Now we have to put the value of b from the first equation in the second equation. Let us take the second equation now.
3a + 2b = 9
3a + 2(5 - 2a) = 9
3a + 10 - 4a = 9
- a = 9 - 10
- a = - 1
a = 1
Now let us put the value of a in the first equation.
2a + b = 5
2(1) + b = 5
2 + b = 5
b = 5 - 2
= 3
So the value of the unknown variable a is 1 and the value of the unknown variable b is 3.
2.146, 2.164, 2.46, 2.614
Answer:
110/170 = 0.6471 = 64.7% or 65%
Step-by-step explanation:
reading | television
Television | 70 | 20 | 90 total for TV
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Reading | 40 | 40 | 80 total for reading
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Total students | 110 | 60 | 170 total students
Students who like BOTH are 70 + 40 = 110 percentage = part/whole = 110/170
Students who ONLY like television = 20
Students who ONLY like reading = 40
(5,28) it's the correct answer
Answer:
Step-by-step explanation:
1/-2
