Y=2100 because you plug in 0 for x. Then you plug in your y value in the equation and solve
4:2 and 2:1 are equivalent ratios to 8:4
the answer should be C. 5.27
N= Heidi's marbles
92 - n =18 (Barry's 92 marbles - whatever Heidi has = 18 marbles difference)
92 -n +n = 18 +n (I added n to each side)
92 = 18+n
92 -18 = 18-18 + n (I subtracted 18 from both sides)
74 = n Heidi has 74 marbles
