exam Maths Puzzle Numerical Ability

Can you please help me solve using the substitution method?

x + y = 1
x + y = 2

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exam Other Question

3(2a+5)+2(3-a) ;a=4 8. How does the t distribution differ from the standard z distribution?
A) Continuous distribution
B) Bell-shaped
C) Family of distributions
D) Symmetrical
E) None of the above