exam Maths Puzzle Numerical Ability

QUESTION: SOLVE THE SYSTEM BY GRAPHING

X+Y=3
X+Y=-1

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exam Other Question

(x3+729)/(x+9) Hi.
Please help. I am lost-my mind is swimming with all the steps and I got lost twice-I need HELP!
The problem is: State the value of the discriminant and the number of real solutions. t^2+14t+49=0
Thank You.