Lisa needs 250 yards of yarn to knit a hat. she has 185 yards of yarn and needs to buy the rest. how many yards of yarn does she need to buy? use the variable y to represent the number of yards of yarn she needs to buy. which equation represents this situation and its solution? y + 250 = 185; y = 65 y + 185 = 250; y = 65 250y = 185; y = 55 185y = 250; y = 55

Option B.

Step-by-step explanation:

It is given that Lisa needs 250 yards of yarn to knit a hat.  

She has 185 yards of yarn and needs to buy the rest.

Let y to be the number of yards of yarn she needs to buy.

Number of yards of yarn she needs to buy + Number of yards of yarn she has = 250

Subtract 185 from both sides.

The required equation is and solution is .

Therefore, the correct option is B.

1 is c

2 is a

3 is a

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18