exam Maths Puzzle Numerical Ability

SOLVE BY SUBSTITUTION METHOD
Y=X-3
X+Y=5
2.)3X-Y=6
X+3Y=2
3.)X=Y-2
X+3Y=2

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exam Other Question

Write the following as a common fraction or mixed number.

4.0171
Can someone please help me with this? What is the vertex, focus, and directrix of the parabola with the equation of :
1. y=1/5(x-2)^2+5
2. y=-2(x+2)^2-3
3. y=3(x-2)^2+5

Find the equation of the parabola with:
4.