exam Maths Puzzle Numerical Ability

I am having problems with solving and graphing the following problem. Can you Help?

1. Plot the graph of the equation 2x+4y=10 and 3x+6y=12 and interperet the result.

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exam Other Question

For each of the relationships below, explain whether you think it is best described by a linear function or a non-linear function. I keep getting confused everytime that I try to One grocery clerk can stock a shelf in 30 minutes, wheras a second clerk requires 45 minutes to do the same job. If the two clerks worked together, how many minutes would it take to stock the shelf?