exam Maths Puzzle Numerical Ability

Solve the equation

square root of 2a = 2

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exam Other Question

Solve the system by substitution

x+y=12
y=2x

y=12+x

Need to solve and graph, the second equation is confusing as to how it fits into the first equation. how do you find the x and y intersect of a problem that dosent have the formula written already but it is in a word problem? THANK YOU!!!!!

how do you find the point where the