book Maths Puzzle Numerical Ability

what is 5y-10+-3y, and teh steps to solve it?
thank you

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book Other Question

Hi. I need to find the area of the following:

A triangle with two 45 degree angles.

Can you explain this please? Thanks Identify the shape of the graph, transform it into standard form, and sketch the graph.
x^2 + y^2 - 14x - 6y -42 = 0