Question

Guys, can you give me spare time helping me answer this

Linear Equations with 2 Variables

By Add a Subt

1a. x-3y=2
2x+3y=13

2b. 2/x+3/y=7
6/x-6/y=1

Answer 1

1a. x - 3y = 2
2x+ 3y=13

3x = 15

3x/3 = 15/3

x = 5

Answer 2

Any questions?

Answer 3

I have to go.

Answer 4

your step thru is a bit confusing

Answer 5

i beleive that there is a "method" that is being asked to apply .... substitution perhaps?

Answer 6

elimination

Answer 7

or is that: by addition or substitution?

Answer 8

elimination will do fine

Answer 9

can you tell me what the easiest elimination in part1 is?

Answer 10

2x+2x is not 0x

Answer 11

x - 3y = 2 <-- * -2
2x + 3y = 13


-2x +6y = -4
2x + 3y = 13
--------------
0x + 9y = 9

Answer 12

ill show you how i did it


x-3y=2
2x+3y=13

x - 2 (x-3y=2)
x- 1(2x+3y=13)

2x-6y= 4
2x+(-)3=(-)13
9y 9
9 9 y=1

Answer 13

so the next part im confused

Answer 14

x-3y=2
2x+3y=13

x - 2 (x-3y=2)
x- 1(2x+3y=13)

2x-6y= 4
(-)2x+(-)3=(-)13 <--- you forgot a negative ....
9y 9
9 9 y=1 , now this makes sense

Answer 15

ok thanks for that, can you help me whats next?

Answer 16

to find x

Answer 17

notice that the ys already eliminate themsleves, so just add em up
vvv
x - 3y = 2
2x + 3y = 13

Answer 18

OR, since you already know that y=1

x - 3y = 2
x - 3(1) = 2

Answer 19

no i think after that its this

x 1 (x-3y=2)
x 1 (2x+3y=13)

how to find x here?

Answer 20

can you help me out with number 2?