Question

x + y = $39.00
x + 2y = $45.50

Answer 1

elimination*

Answer 2

Subtract the first equation from the second to instantly get y.

Answer 3

Then plug in y into equation 1 to get x. Done. :)

Answer 4

-1y = -6.5 ?

Answer 5

Yeah, so +y = +6.5. Then plug that back in to find x.

Answer 6

x + y = $39.00
x + 2y = $45.50

x = 39 - y
x = 45.5 - 2y

x = x

39 - y = 45.5 - 2y

2y - y = 45.5 - 39
y = 6.5

Answer 7

Too long hero, its easier to subtract/add than substitute :P

Answer 8

How come you didn't do it then? I could have skipped steps if I wanted, but for the sake of demonstration, included most steps.

Answer 9

btw.

for;

6x + 4y = 1128

would x = 108
and y = 120 ?

Answer 10

Didn't mean to offend you or anything, but I just said that doing the problem by subtracting the equations is a faster method. I didn't do it because its better that Justine gets practice doing it herself...

Answer 11

Are you given a second equation in addition to 6x + 4y = 1128.

Answer 12

I made is from a word problem, but not sure. Hold on 1 min

Answer 13

At all you can eat restaurant bbq fundraiser that you are sponsoring, adults pay $6 and kids pay $4 for a dinner. 212 people attend, and you raise $1128. How many adults attended? How many kids?

Answer 14

Rogue, you can't offend me and I do things my way. No offense, but I don't need you to tell me what's easier. I prefer to use my own methods.

Answer 15

Alright, thats fine with me, Hero :)

For the word problem, let x = # of parents, y = of kids.
x + y = 212
6x + 4y =1128
Now just solve the system.