exam Maths Puzzle Numerical Ability

can you please help me graph: (((x+y<1)))

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exam Other Question

can you help me solve this equation for x?

25x^2=13 I have an equation of 4x=36 I looked at other examples of how to do it but I dont seem to understand how to figure it out, v/3 = -11 this is another one as well this is on a worksheet not a textbook