I will be using the substitution method
y=2x+5
y=x+4
____________
because y=y and they are the same,
2x+5=x+4
-5 -5
-------------
2x=x-1
-x -x
------------
x=-1
then plug in
y=2x+5
y=2(-1)+5
y=-2+5
y=3
____________
y=x+4
y=(-1)+4
y=3
the answers are the same, that is the check
Answer:
11y^2 +8y +16
Step-by-step explanation:
Perhaps you want to find the difference ...
(6y^2 +2y +5) - (-5y^2 -6y -11)
= 6y^2 +2y +5 +5y^2 +6y +11
= 11y^2 +8y +16
Answer:
-30
Step-by-step explanation: