there are thre ways combining variables pairs xy yz and zx write down what sort correlation

there are thre ways off combining the variables in pairs (xy, yz and zx) write down what sort of correlation each pair will have. x:the number of people who travell to work by car each month. y:the number of people who travell to work by public transport each month. z:the amount of car exhaust pollution each month. illustrate each corollation by sketcing a scatter graph
 
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