Asked by Dimbai Jose Jimenz
Solve by subtitude 5a +2b = 20
2a + b = 11
2a + b = 11
Answers
Answered by
Bosnian
In second equation subtract 2 a to both sides.
b = 11 - 2 a
Put this in first equation.
5 a + 2 b = 20
5 a + 2 ( 11 - 2 a ) = 20
5 a + 22 - 4 a = 20
a + 22 = 20
Subtract 22 to both sides
a = - 2
You still knov:
b = 11 - 2 a
so
b = 11 - 2 • ( - 2 )
b = 11 + 4
b = 15
The solution is:
a = - 2 , b = 15
b = 11 - 2 a
Put this in first equation.
5 a + 2 b = 20
5 a + 2 ( 11 - 2 a ) = 20
5 a + 22 - 4 a = 20
a + 22 = 20
Subtract 22 to both sides
a = - 2
You still knov:
b = 11 - 2 a
so
b = 11 - 2 • ( - 2 )
b = 11 + 4
b = 15
The solution is:
a = - 2 , b = 15
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