Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
ANSWER PLZ EASY 10 POINTs?
soleve the following system of equations using elimination
7x+3y=0
21x-9y=4
Details please
Solve using substitution
a^2 + b^2 = 8
a=b
HELP PLEASE
and
NYC school is selling tickets. 1st day school sold 3 senior citizens and 1 child for $38 and 2nd day school sold to 3 senior citizens and 2 child. price of senior citizen and child ticket.
(I think this question doesnt have enough info..leave it if not possible.)
1 Answer
- 1 decade agoFavorite Answer
The first thing to do is get either x or y by itself in one of the equations. let's use the first one:
7x=-3y so x= -3y/7
Now wherever there is a x in the second equation substitute what it equals (-3y/7)
So 21(-3y/7) - 9y=4
expand your first term
-63y/7 - 9y = 4
You could solve for y in different way now, but how I would do it is
-63y/7=4+9y
multiply by 7
-63y=28+63y
now bring the 63y back over
-126y = 28
y= -4.5
Now wherever there is a y in the first equation substitue that in to find x
For the second question do the same. Let senoir tickets be x and child tickets be y
so : 3x + 1y = 38
3x + 2y = ???
