Question

http://prntscr.com/226vpj

Answer 1

If you solve \(9 - x = -3y\) for x what do you get?

Answer 2

3?

Answer 3

No. If you solve for x you're going to get an expression in the form of \(x = \) and there will be y and some other stuff on the right side. Because you haven't actually gotten rid of y at this point.

Answer 4

i got no solutions as the answer cuz nuthing plugged into the first equation correctly

Answer 5

is that right?

Answer 6

No, it isn't.

Answer 7

i thibk D makes sense cuz i got -9 and 9

Answer 8

I have no idea what you're saying.

Do you want me to explain to you how to do this problem or do you want to keep guessing randomly?

Answer 9

explain please

Answer 10

Ok, let's try to solve it by substitution. The first equation is solved for x, so let's substitute that into the second equation.

\[9 - (3y + 9) = -3y \\ 9 - 3y - 9 = -3y \\ -3y + 9 - 9 = -3y \\ -3y = -3y \\ y = y\]
In other words, there are infinite solutions.

Answer 11

If this isn't clear why this means infinite solutions, try solving the second equation for x. You'll get \(x = 3y + 9\). In other words, the "two" lines are exactly the same line, which means they intersect everywhere because they are exactly the same. So, there are infinite solutions.

Answer 12

thank you

Answer 13

http://prntscr.com/2270r0

i think this 1 is also infinite solutions? can you confirm?

Answer 14

No. It does not have infinite solutions.

Answer 15

i guess its no solution right? cuz A and D dont make sense i think

Answer 16

Don't think of it in terms of the multiple choices unless you're really short of time or something. You don't really learn anything if you don't work through it.

Answer 17

i worked thru thm but i dont thick choices a and D made snese so i went with no solutions

Answer 18

Equation 1 says \(-3x - 3y = 5\)
Let's make equation 2 look like that.
\[-3y = 3x - 2 \\ -3x - 3y =-2\]
The same combination of x and y can't add up to both 5 and -2. So it's clearly no solution.

Answer 19

thanks you so B is right?

Answer 20

You tell me.

Answer 21

you said the combination cant make 5 and -2 so its no solution right?

Answer 22

Right.

Answer 23

thank you. i need help with 1 more please. i got no solutions as well because the other choices didnt compute right

http://prntscr.com/2272nh

Answer 24

If you're just going to try the choices and don't actually to solve the equations I'm not going to help you.

Answer 25

-6=3x+y=2
and 4x=4+5y with both x and y=24

Answer 26

might of messed up on the first part

Answer 27

so i ended up getting B becuz both x and y ended up equaling 24