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A group of students went to the fast-food restaurant after a game. They each ordered a 6-pc nugget entrée and a garden salad tray to share. Each student was given a $5 gift card to use. Solve the equation 3.20n + 9 = 5n to determine the number of friends n who went to the restaurant. Justify each step.



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Respuesta :

I’m guessing you want to find out (n).
That’s what I did anyway.

The answer is: n=5

Step 1: Subtract 5n from both sides.
3.2
n
+
9
−
5
n
=
5
n
−
5
n
−
1.8
n
+
9
=
0
Step 2: Subtract 9 from both sides.
−
1.8
n
+
9
−
9
=
0
−
9
−
1.8
n
=
−
9
Step 3: Divide both sides by -1.8.
−
1.8
n
−
1.8
=
−
9
−
1.8
n
=
5

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