in the figure below, angle x form vertical angles. angle y forms a straight line with the 80° angle and the 60° angle.

write and solve an equation to determine the measure of angle x.

Adding angle x, the 80 degree angle, and the 60 degree angle should give you 180 degrees, a straight line, because they all lie on the straight line. So we can create the equation:



Simplify:



Subtract 140 to both sides:

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