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The sum of a triangle's interior angles is $180_{∘}.$ From the figure, we can see that one of the angles is a right angle. The remaining two are $x$ and $y.$ By adding these together, we can equate their sum with $180.$ $x+y+90=180$

b

$x−6=5y$

Substitute$x=90−y$

$90−y−6=5y$

Solve for $y$

SubTermSubtract term

$84−y=5y$

AddEqn$LHS+y=RHS+y$

$84=6y$

DivEqn$LHS/6=RHS/6$

$14=y$

RearrangeEqnRearrange equation

$y=14$