Question

3-x<1 is this correct? (-infty, -4]

Answer 1

it tells me its incorrect, am i typing it wrong?

Answer 2

-x < -2
x > 2

Answer 3

(2, inf)

Answer 4

-3-x<1 sorry i typed the problem wrong

Answer 5

(-4,inf)

Answer 6

thats right but can you tell me why?

Answer 7

-3-x<1
3+x>-1
x>-4

Answer 8

\[-3-x<1\]
\[-3<x+1\]
\[-4<x\]
x is GREATER than -4

Answer 9

well i got that but why isnt it -\[\infty\]

Answer 10

-x < 4
x > -4
when dividing both sides by a negative the inequality sign flips

Answer 11

oh yeah i knew that... lol

Answer 12

oh ok
so you also understand why its (-4,inf) right

Answer 13

you can multiply by a negative number and change signs if you like. but you can also just add to both sides to assure that the coefficient of x is positive

Answer 14

\[-x>10\]
\[-x+x>10+x\]
\[0>10+x\]
\[-10>x\]

Answer 15

yeah that might be easier so i dont forget, thanks