Respuesta :

iGreen
First of all, we know that a line is 180°. This means if we add the angles of 61°, 57°, and angle y, we should get 180°.

[tex]\sf 61\textdegree +57\textdegree+y=180\textdegree[/tex]

Simplify:

[tex]\sf 118\textdegree +y=180\textdegree[/tex]

Subtract 118° to both sides:

[tex]\sf y=62\textdegree[/tex]

We also know that all three angles of a triangle add up to 180°. So we have:

[tex]\sf 67\textdegree+62\textdegree +x=180\textdegree[/tex]

Simplify:

[tex]\sf 129\textdegree +x=180\textdegree[/tex]

Subtract 129° to both sides:

[tex]\sf x=\boxed{\sf 51\textdegree}[/tex]
CarmenBrown
Because we know that 180° is a straight line we can subtract 57° and 61° from it to get 62°. After that we can add 62° and 67° to get 129°. Now all we have to do is subtract 129° from 180° to get 51°. So the measure of the angle of x is 51° which makes the answer D.