Answer:
243
Step-by-step explanation:
sorry i dont know
3x2+2xy−y2
=(3x−y)(x+y)
(3x−y)(x+y)
Harriet can buy 7 of type a and 8 of type b
13 units
(x₁,y₁) = (-5 , 3) & (x₂ , y₂) = (7 ,8)