exam Maths Puzzle Numerical Ability

2y�+6=y�

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Please help me solve the problem;

Find the measure of the acute angle that the line y=2/3x +2 makes with a horizontal line. Round the answer to the nearest tenth.

Appreciate your help. Thanks

Rupert c=√(a^2+b^2 )solve for "a"
Does anyone know how to figure out for "a" instead of "c"? Help please, and thank you so much!!