SOLUTION: Is (-1,5)a solution of each system?explain. x+y=4 x=-1

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Question 128956This question is from textbook
: Is (-1,5)a solution of each system?explain.
x+y=4
x=-1 This question is from textbook

Found 2 solutions by tutorcecilia, MathLover1:
Answer by tutorcecilia(2152) About Me  (Show Source):
You can put this solution on YOUR website!
Yes, because:
If you substitute x=-1 in the first equation, you get:
(-1)+y=4
y=4+1 (solving for the y-value)
y=5
.
Checking:
(-1)+(5)=4
4=4 (checks out)

Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
x%2By=4...........(1)
highlight%28x=-1%29............(2)
substitute x from (2) in (1)
-1%2By=4...........(1)
y=4+%2B+1...........(1)
highlight%28y=5%29...........(1)
so,(-1,5)is a solution of each system