exam Maths Puzzle Numerical Ability

I need help solving Radical Equations, because i dont really understand it yet.
one of my questions is

square root of 5x (no longer under radical) minus 2 equals 3

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exam Other Question
Find the slop and y-intercept and use them to graph the line
y = x - 1



y = 2/3x + 2



4y - 3 = -3x - 11 Fifi and Maxx together weigh 72 pounds
Maxx and Sparky have a combined weight of 86 pounds
Sparky and Fifi have a combined weight of 35 pounds

So how much does each dog weigh?