book Maths Puzzle Numerical Ability

please solve for x and y
y=-2x+6
y=x

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book Other Question

this is not for distribution. this is simplifying expressions. if you could explain EACH STEP in detail that would be good as i need it to guide me through the other questions.. You are going to purchase two types of computers for your business. If computer A costs $700 and computer B costs $500, then how many of each should you buy if you need 16 computers and you have $10,000 to spend?