exam Maths Puzzle Numerical Ability

y + • w is this an expression?

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exam Other Question

Given the number as measurements of the sides of a triangle, can the triangle exist, and explain :

A - 8, 10, 20

B - 16, 18, 25

C - 7, 7, 7
How would solve this system by graphing?
x + y = 3
x + y = -1