exam Maths Puzzle Numerical Ability

Solve each of the following systems by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent.
10x + 2y = 7
y = -5x + 3

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exam Other Question

In a card game, a hand of 5 cards contains at least 2 spades. What is the probabilitiy that there are exactly 4 spades in this hand?

The answer is 0.0292
Any help would be ap hi, i would like to know a formula that can find the area of a irregular polygon or any irregular polygon. so please try to help me.

thanks a lot.
bye.