What is the constant of proportionality in the equation y=\dfrac12xy= 2 1 xy, equals, start fraction, 1, divided by, 2, end fraction, x? constant of proportionality

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how

Aboard 60 in. long is cut two parts so that the longer piece is 5 times the shorter. what are the length of the two pieces?