exam Maths Puzzle Numerical Ability

graph 3x+2y=6

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exam Other Question

A number is 2 1/10 more than its reciprocal. Find the number.
{2/3, 3/5, 5/4, 5/2}

Please teach me how to do this in order by order!!! PLEASE!!! Thank you.
0.0625a + 0b + 0c + 0d =0
-0.125a + 0.5b - 0.25c + 0d=5.625
0a - 0.25b + 0.55c - 0.1d =0
-0.25a + 0b -0.1c + 0.4d =-7.5