Answer:
x = -1
y = -9
Step-by-step explanation:
7x - 3y = 20
7x - 3(5х – 4) = 20
7x - 15x + 12 = 20
-8x = 20 - 12
x = 8/-8
7(-1) - 3y = 20
-7 - 3y = 20
-3y = 20 + 7
-3y = 27
y = 27/-3
