exam Maths Puzzle Numerical Ability

1.solve by graphing
5x-y=3
y=5x-3
2. solve by back substtution
2 4 1 :1
1 -2 -3 :2
1 1 -1 :-1

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exam Other Question

Calculate the probability of drawing four cards out of a standard deck.

P(4 of a kind)
P(All the same suit)
P(All the same #)

Thanks So much! The smaller of two numbers is 12 less than the larger. One-half of their sum is 46. Find the numbers.