exam Maths Puzzle Numerical Ability

graph the equation
y=x+1

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Please help me with this problem am having lots of problems with math especially graphing. Thank you.

Solve the system by graphing.
3x + y = -1
9x + 3y = -3 An alloy of metals is 25% copper another alloy is 50% copper. How much of each alloy is used to make 1000 grams of an alloy with 45% copper.
Can you help us write this equations?