Question

Solve by the addition method. (You may first have to multiply both sides of one equation by -1) Problem: 3x+y=13 x+y=3

Answer 1

mult both sides of 2nd equation with -1 then add 2 equations together, so y is gone, now u can find x, then plug result found for x in any of the 2 equations to get y.

Answer 2

so would I do it like this: x+ (-1) y=3(-1) ? then solve

Answer 3

you need x to times -1 too, like this (-1)(x+y)=3(-1)
(-1)x + (-1)y = 3(-1)

Answer 4

so x = -5?

Answer 5

nope, x=5

Answer 6

How would you do this equation: x + 2y = -2 4x + 2y = -17 ?

Answer 7

would x be -5 and y be -3/2?

Answer 8

you get the last one right?
So its the same for this one. time the first equation with (-1)
(-1)(x+2y)=(-2)(-1)
-x -2y = 2
then add this to the 2nd

Answer 9

you got x right but y is wrong

Answer 10

check ur work, y should be 3/2

Answer 11

I accidently put the - I had 3/2. See if you can help me with this problem: -5=10x+3y -1= 2x-3y?

Answer 12

lol this is even simpler, you dont need to change anything, just add them straight

Answer 13

x=5

Answer 14

not -5

Answer 15

I told you the problem wrong, I'm sorry : -5=-10x+3y 1=2x-3y

Answer 16

its still a good problem

Answer 17

same thing
-5 = -10x + 3y
+
1 = 2x + (-3y)
__________________________________
-4 = -8x + 0
then x=2, so find y

Answer 18

lol sorry 1/2, I should go back to kindergarten

Answer 19

lol i was just fixing to say that

Answer 20

not the kindergarten part

Answer 21

yep, that was stupid

Answer 22

So is y 5?

Answer 23

which question do you mean? the last one with -5=-10x...., y should be 0