Which of the following sets of values is a soulution to the following system of liner expressions, 4x+y=24 x-y=-4
2 answers:
It is the first answer, x=4; y=8
Set up and add equations:
4x+y=24
+ x-y=-4
So 5x=20 (the y’s cancel)
X=4
Then substitute in 4(4)+y=24
16+y=24
Y=8
Answer:
x=4, y=8
Step-by-step explanation:
4x+y=24
x-y=-4
Add the two equations together to eliminate y
4x+y=24
x-y=-4
----------------
5x = 20
Divide by 5
5x/5 = 20/5
x = 4
We still need to find y
x-y = -4
4 -y = -4
Subtract 4 from each side
4-4-y = -4-4
-y = -8
Multiply by -1
-1 * y = -8 *-1
y= 8
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