exam Maths Puzzle Numerical Ability

How do you work substitution equations?

ex.

t=0.2s+10
4s+5t=35

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exam Other Question

Determine if the ordered pair a solution of the inequality ?
(3,12); 5y-6x>3

Help me with this please.
for what value of "a" will the two lines x+3y+2=0 and 6x+ay=0 be perpendicular?