exam Maths Puzzle Numerical Ability

WRITE THE FOLLOWING PHRASE USING SYMBOLS. USE THE VARIABLE X TO REPRESENT THE NUMBER. A NUMBER DECREASED BY 1

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Please, I need some help with these problems. If anyone can help please.

1. {4x+y=13
{2x-y=5

2. {2x+4y=6
{5x+10=15

3. {x+y-z=-1
{-4x-y+2z=-7
{2x-2y-5z=7
Help me please...

Perform operations as indicated

square root -98 + square root -32


Thank You!