Question

what is y in the following system

x+3y =6
2x-7= 10

Answer 1

@dan815 @whpalmer4

Answer 2

pleasee

Answer 3

solve the second equation for x,

then substitute that into the first

Answer 4

This guy knows what he is talking about ^

Answer 5

oh whoops that is a typo. the 7 is supposed to be Y

Answer 6

2x-y= 10

Answer 7

so what do i do then ?

Answer 8

x+3y = 6
2x -y = 10


multiply the second equation by three

then add it to the first equation

the y terms will drop out,
so you can solve for x

then substitute this x into the first equation,
and you'll be able to solve for y

Answer 9

x = 5.142 ?????

Answer 10

That's the elimination approach. Another approach, for which this problem is better suited than some, is substitution. The first equation is easy to solve for x. x = 6-3y. Now substitute (6-3y) in the second equation wherever you see x. That gives you an equation only in terms of y. Solve that. Plug the value into x = 6-3y to get the value of x.

You should get the same result either way; sometimes one approach is easier to do the work than the other.

Answer 11

Yes, that's correct, but I would leave the answer in fraction form: x = 36/7 unless someone specifically asks for a decimal.

Answer 12

how would i plug that in?

Answer 13

36/7 + 3y = 6

Answer 14

how would you plug what in? x=36/7?

36/7 + 3y = 6

multiply both sides by 7 to get rid of the fraction

36/7*7 + 7*3y = 7*6
36 + 21y = 42
you can do the rest, right?

Answer 15

oooohhhh

Answer 16

i got y = .28

Answer 17

im so lost -_-

Answer 18

y = 2/7, yeah

Answer 19

the answer choices are in slope intercept form

Answer 20

i think 2/7 can be 1/3 .

Answer 21

choices are :
1/3x + 2
-1/3 x+6
-x+2
-1/3x + 2

Answer 22

are you sure you haven't mixed two problems together?

x+3y=6
solve for y
3y = 6-x
y = 2-x/3
y = (-1/3)x + 2

Answer 23

hm. maybe i did im really tired. can you help with some more

Answer 24

we can find out :-)