exam Maths Puzzle Numerical Ability

How would I solve this system by graphing, and what would the coordinates be?
2x + y = 4
x + y = 3

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exam Other Question

2x^2-x=6 There are 40 cows and chicken in the farmyard. One quiet afternoon, Jack counted and found that there were 100 legs in all. How many cows and chickens are there? Solve this problem by writing and solving an equation.