26x3=78
78-x=72
x=6
She needs to buy at least 6 more to have enough for 26 students
-2x^4 + 10x^3 - 21x^2 + 19x - 4
that should be the right answer
Answer:
t=1
Step-by-step explanation:
16-2t=t+9+4t
Combine like term
16-2t = 5t+9
Add 2t to each side
16-2t +2t= 5t+2t+9
16 = 7t+9
Subtract 9 from each side
16-9 = 7t+9-9
7 = 7t
Divide each side by 7
7/7 = 7t/7
1=t
y = -2x + 1
y = -2x -3
none cuz they're both -2x