C
because in X, the difference from 4 to 6 is 2, the difference from 6 to 10 is 4, the difference from 10 to 12 is 2
so n = 3
in Y, 1 to 9 is 8, 21 to 25 is 4.
9 + 6 is 15
ian gone lie this got me confused
step-by-step explanation:
y=-2.5x+12.5
5y=2x+10
y=0.4x+2
slope=-2.5
5=-2.5*3+b
b=12.5