exam Maths Puzzle Numerical Ability

y=x^2-2x-1

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exam Other Question

for the inequality 2x+3y>6
what is
1. slope
2. direction of the line (rise or fall left to right)
3. dotted or solid line
4. shading above or below the line
x + y = 8384

x + z = 8221

What does x,y, and z equal?