Answer:
<u>15</u>
<u>2x</u>
Step-by-step explanation:
Answer:

» Collect like terms, r terms on the left hand side by subtracting r from both sides and adding st to both sides

» On the left hand side, factorise out r

X=60 and y=20
x and y can be many things that answers the question to 120
The graph is shown in the attached image.