exam Maths Puzzle Numerical Ability

Plot the graph of the equations 2x + 4y = 10 and 3x + 6y = 12 and interpret the result. Please Help me I need to know what to do my work is going to be late.

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exam Other Question

Write each expression in simplest form:

4r^2 - 25s^2
------------
2r^2 + 3rs - 20s^2

With this equation I am so lost and confused of how to even start the procedure! Is there any help out there for me? Thank you :-)
write log2x=y in exponential form.

what does this mean?