Please help asap, and if you can explain why after the answer, please and thank you❤️

Solve the system of equations y= 3/2 - 1, -x+ y =-3

72 the length of a side of a triangle is 36. a line parallel to that side divides the triangle into two parts of equal area. find the length of the segment determined by the points of intersection between the line and the other two sides of the triangle.

Alex measured the length of an item to be 3.7 cm. the actual length is 3.5 cm. what is alex’s percent error?