exam Maths Puzzle Numerical Ability

2xy-4xt3y-6

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exam Other Question

We need help with a problem in an 8th grade Pre-Algebra book. The directions are to simplify the following: -||-4| + |-21||
What do the double brackets mean? Thanks for your help.
Could someone graph this problem for me?

Graph the inequality:
3x + y <=5

I would appreciate it allot.
Thanks,
Jamie