Help!!

Question

Help!!

kmullis6 · Answer

Solve the system of equations by substitution. What is the solution for x?

2x + y = 1
4x + 2y = -2

x = 0

x = 2

There is no x value, as there is no solution.

x can be any value as, there is an infinite number of solutions. 

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I'm pretty sure it's C.

mayankdevnani · Answer

http://openstudy.com/users/mayankdevnani#/updates/54322aa8e4b0fabfe0cb6bd6 its just a way how to solve these type of equations !!

mayankdevnani · Answer

hope you understood ! @kmullis6

anonymous · Answer

it is C

mayankdevnani · Answer

attachment

mayankdevnani · Answer

hint ^^^^^

anonymous · Answer

a) because it is always C

anonymous · Answer

b) because if you multiply the first equation by $2$ on the left, you get the second equation, but $2\times 1\neq -2$ so the two lines are parallel

mayankdevnani · Answer

another way :-
$$\large \bf 2x+y=1...................(1)$$
$$\large \bf 4x+2y=-2....................(2)$$

mayankdevnani · Answer

divide equation(2) by 2,we get
$$\large \bf 2x+y=-1....................(3)$$

mayankdevnani · Answer

you can observe that equation 2 and equation 3 have same LEFT HAND SIDE equation but different RIGHT HAND SIDE EQUATION,and we know that the solution is common to both but why there is 2 results !!

So,NO SOLUTION OF x is there.

mayankdevnani · Answer

hope you understand.@kmullis6

mayankdevnani · Answer

@kmullis6

mayankdevnani · Answer

are you there ??????????????????

kmullis6 · Answer

sorry, i stepped away for a minute.

mayankdevnani · Answer

so understood ???

kmullis6 · Answer

yeah i do, thank you for the explanation (:

mayankdevnani · Answer

welcome :)