exam Maths Puzzle Numerical Ability

Please help.

Solve the following systems by substitution.

5x - 2y = -5
y - 5x = 3

Thanks
JMS

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exam Other Question

The cost in dollars of manufacturing w wing nuts is given bythe expression 0.07w +13.3. Find the cost when 375 wing nuts are made. What is the average cost to manufacture one wing nut? 2log2+3logx-1/2{log(x+3)+(x-2)}

i am having such a hard time with this question!!!!!