Put x = 7 and y = 6 to the equations:
-2x + y = 20
L = -2(7) + 6 = -14 + 6 = -7
R = 20
L ≠ R
Answer:
21
Step-by-step explanation:
3x7=21 possible combinations
here is a contradiction because in one inequality x can be equal to 15 ; and in the other it cannot