exam Maths Puzzle Numerical Ability

graph the two lines y1=3*-5 and y2=-7x+4on the same graph. use algebra to find the coordinates of their point of intersection to 3 decimal places

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exam Other Question
How many grams of pure salt must be added to 40 g of a 20% salt solution to make a solution that is 36% salt? Solve the system of equations:
9^(3x-y)=(1/81)^-1
(sqrt5)^(2x-y)=1