solve the linear system using substitution. 4x  y =5 4x + 4y = 4
Mathematics
powell991
Question
solve the linear system using substitution.
4x  y =5
4x + 4y = 4
4x  y =5
4x + 4y = 4
1 Answer

1. User Answers togunsile2008
4x  y =5
4x + 4y = 4
Change all the signs of the first equation
4x + y = 5
Add 4x to both sides
y == 4x  5
Substitute for y in second equation
4x + 4(4x  5) = 4
4x + 16x  20 = 4
20x  20 = 4
Add 20 to both sides
20x = 16
Divide both sides by 20
x = 16/20 === 4/5
Substitute to find y
y == 4x  5 == 4(4/5)  5 == 16/5  5 = 9/5
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