77 is the median score for rhis propblem
here's the solution,
we know that, sum of <u>measures</u> of each interior angle of a <u>triangle</u> = <u>180°</u>
<u>F</u><u>igure</u><u> </u><u>1</u><u>.</u>
=》

=》

=》

=》

=》

<u>Figure</u><u> </u><u>2</u><u>.</u><u> </u>
=》

=》

=》

=》

=》

=》

<u>Figure</u><u> </u><u>3</u><u>.</u>
=》

=》

=》

=》

=》

=》

M= slope B = y intercept
So the 4 would be the slope and the -5 would be the y intercept