exam Maths Puzzle Numerical Ability

i do not understand linear graphs

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exam Other Question

can someone help me with this problem:

Is this a function:

x^2 + y^2 = 36

a. yes
b. no
c. it depends
d. none of the above x/4 - y/11 = -9/44

x/6 - y/13 = -1/26