exam Maths Puzzle Numerical Ability

2x=y=1
2x-y=5
please helpme solve this equation by graphing

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exam Other Question

Find the following if f(x) = 4x -3 f(-1)

-1 = 4(-1) - 3
-1 = -4 -3
-1 = -1

Double checking to see if I did these right (x/3-y/2)(x/3-y/2)=