exam Maths Puzzle Numerical Ability

how to solve this equation x+y<5 x-y>1 by using the graphs of linear inequalities

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exam Other Question

Solve the following equations:

a: x^3-4x=0
b: 2x^2+7x-15=0
I am not able to figure these out. Can someone help me through a couple

1.) log4x+log4y-log4m

2.) ln54-ln6

3.) log(x-2)-log(x-2