exam Maths Puzzle Numerical Ability

for what value of "a" will the two lines x+3y+2=0 and 6x+ay=0 be perpendicular?

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exam Other Question

How do you work substitution equations?

ex.

t=0.2s+10
4s+5t=35 Find the axis of symmetry...
1. y=-x^2+4x+2
2. y=x^2+x+1

Find the x-intercepts...
1.y=x^2+2x-8
2. y=x^2-5x-10