Answer:
x = 20
y = 10
Step-by-step explanation:
Rewrite the 2nd equation to make x the subject:
x + y = 30 ⇒ x = 30 - y
Substitute x = 30 - y into the first equation and solve for y:
20(30 - y) + 25y = 650
600 - 20y + 25y = 650
600 + 5y = 650
5y = 50
y = 10
Substitute found value of y into x = 30 - y to find x:
x = 30 - 10 = 20
So x = 20 and y = 10
