Question

this is a simple question,
2x+y=4
how dose that turn into y=2x-4
in other words how did the 2x become positive?
like 2x-4y=5
how did it tun into
-4y=2x-5
how did 2x become positive?

Answer 1

if u move the number or varialbe to other side the sign changes like example
2x-y=0 and u move y to other side than the y varialbe becomes positive which will be now
2x=y

Answer 2

see the rule is that when numbers or terms are taken from one hand side (left or right) from the equal sign the term changes its sign.very important note.

Answer 3

it usually depends on the quesiton if ur finding x or y variable than you need to make the variable alone and move numbers to others side or other variables

Answer 4

and btw when its 2x+y=4 its gogin to be y=-2x+4 not positive

Answer 5

the sign has to change when u move to other side

Answer 6

any questions?

Answer 7

no thanks for clearing that up!

Answer 8

did i answer ur question?

Answer 9

well the two equations above are suppose to be perpendicular but the slope is not negative reciprocals... so I thought i did the problem wrong @jkim3592

Answer 10

oh thats the slope?

Answer 11

when ur finding perpendicular slopes the all the signs change

Answer 12

srry g2g

Answer 13

y=-2x + 4, and y= 2/4x - 5/4 .the second is opposite sign and 2/4 = 1/2 is reciprocal to 2. i found equations applying each consecutive operation on both sides