1. Given that p=5xy + q, express y in terms of p,q and x.
2.Given that p=7x +4q, express x in terms of p and q.

The equation p=5xy+q can be expressed in terms of p,q, and x as y = (p-q)/5x.The equation p=7x+4q can be expressed in terms of p and q as x = (p-4q)/7x.Given in the first equation, p = 5xy+qp-q=5xyy=(p-q)/5xHere we need to express y in terms of p,q, and x so we need all these three variables on one side of the equation and y on the other side. Initially we more q to the left-hand side of the equation which makes it p-q=5xy. Now we divide the left-hand side and the right-hand side by 5x making the equation y = (p-q)/5x.Similarly in the second equation, p = 7x+4qp-4q = 7xx = (p-4q)/7Here we need to express x in terms of p and q so we need all these two variables on one side of the equation and the term x on the other side. First, we will move 4q to the left-hand side of the equation which will make it p-4q=7x. Now, we will divide the whole equation by 7 which will make the equation x = (p-4q) / 7. To learn more about simultaneous, transposing and rearrangement of the equations,https://brainly.com/question/15165519

[tex]\huge\mathcal{♨Answer♥}[/tex]Answer is on the attachment...☆...hope this helps...☆_♡_mashi_♡_