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Madelyn Ellison
Mathematics
29 October, 09:16
20.
Solve the system.
3x + y = - 6
6.2 + 5y = 6
+5
Answers (
2
)
Anabel Lyons
29 October, 09:17
0
Answer: x = - 1.9867 and y = - 0.0399
Step-by-step explanation: What we have here is a pair of simultaneous equations which are;
3x + y = - 6 - - - (1)
6.2 + 5y = 6 - - - (2)
From equation (1), we shall make y the subject of the equation. So, let
y = - 6 - 3x
Substitute for the value of y into equation (2)
6.2 + 5 (-6 - 3x) = 6
6.2 - 30 - 15x = 6
Collecting like terms we now have
6.2 - 30 - 6 = 15x
Remember that when a negative value crosses to the other side of an equation it becomes positive and vice versa
-29.8 = 15x
Divide both sides of the equation by 15
x = - 1.9867
We can now substitute for the value of x into equation (1)
3x + y = - 6
3 (-1.9867) + y = - 6
-5.9601 + y = - 6
By collecting like terms we now have
y = - 6 + 5.9601
y = - 0.0399.
Hence x = - 1.9867 and y = - 0.0399
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Benitez
29 October, 09:42
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The first one 3x + y = - 6
First 3x + y = - 6
-3 - 3x
--. - -
y = - 3x-6
Second 6.2 + 5y = 6
-6.2. - 6.2
--- - - --
5y = - 0.2
- - - --
5. 5
y = - 0.2/5 or - 0.04 as decimal
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