need help here please (1 Viewer)

[Mark576]

Solve 4x < / 15 < / -9x

only confused because the answers say that x = 0 is included, when clearly it doesn't satisfy the inequation.

btw, < / means less than or equal to. thanks!

 

[watatank]

What's the question?

 

[Mark576]

Yeah it didn't show up at first, I had to change the symbols used.

 

[PC]

You are coming up with the strangest questions!

Do it in bits.

1. 4x <= 15
x <= 3 3/4

2. 15 <= –9x
–9x => 15 (just swap the sides around)
x <= –1 2/3 (remember to change the direction of the inequation when dividing by a negative)

Now both these conditions have to hold simultaneously. So the overall solution must be x <= -1 2/3.

x=0 is not a valid solution, as it doesn't satisfy the right part of the equation.

 

[Mark576]

yeah thanks, I thought that was it - incorrect answers are always so confusing! haha

 

[bos1234]

where do u get ur qns from?

 

[Mark576]

They're just questions from my first preliminary mathematics exam