One hat and two shirts costs $21. two hats and one shirt $18. megan has exactly enough money to buy one hat and one shirt. how much money does megan have?

Suppose Megan has enough money to buy 1 hat and 2 shirts for $21 and then another 2 hats and 1 shirt for $18.  In total, she has bought 3 hats and 3 shirts for $39.  But she has enough for only 1 hat and 1 shirt and so Megan has 39 ÷ 3 = $13.

need more information

step-by-step explanation:

b. y = 4x - 2

step-by-step explanation:

to find a parallel equation to an equation, make sure both equations have the same slope but different y-intercepts.

y = 4x + 1

4 = slope

1 = y-intercept

y = 4x - 2

4 = slope

-2 = y-intercept

they both have the same slope but different y-intercepts, so, b. is the correct answer.

and to check your work, you can graph both equations. : )