Question

Can anyone figure out what x and y are in this problem using th method: Elimination.?
7x - 3y = 20
5x + 3y = 16
Thanks.(:

Answer 1

is this algebra 1??

Answer 2

Yeah

Answer 3

by sum :
7x - 3y = 20
5x + 3y = 16
--------------
12x+0=36
x=36/12=3

Answer 4

I know you subtract and end up with 12x = 36 or am I wrong?

Answer 5

ok well, um thats it @baziham lol :)

Answer 6

and by equation 1:
7x - 3y = 20
7(3) - 3y=20
21 - 20 = 3y
1= 3y
y= 1/3

Answer 7

Whats x then?

Answer 8

or is there no x? :o

Answer 9

x=3
i write it at the end of first post
ok?

Answer 10

I know you subtract and end up with 12x = 36 or am I wrong?

almost. you add.
you can do it like baz showed,(which is how I would do it) or
like this, all on one line
7x +5x - 3y +3y = 20+16
simplify and you get 12x=36 and x= 36/12 or 3

Answer 11

now use x=3 in either equation and solve for y

Answer 12

Oh, I gotcha. And I ment to say add. Lol.

Answer 13

and the reason we add is because we noticed that -3y + 3y is zero, making the y's disappear.

Answer 14

Oh! Thankyou! You all are such a big help.! I was so confused.