book Maths Puzzle Numerical Ability

How do you do y= 2x + 3 using substitution?
y= 3x + 1

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book Other Question

When x number of units are sold, the price of each unit (in dollars) is given by p=-x/2 + 75. Find the unit price when the following quantities are sold. 2,7,9,11. y=4-(x-2)^2