Math
posted by Carly .
Robin cross stitches bookmarks and wall hangings . A bookmark takes her 1 1/2 days, and a wall hanging takes her 4 days. Robin recently spent 18 days cross stitching 7 items. Solve the system of equations to find the number of bookmarks b and the number of wall hangings w that Robin cross stitched.
1 1/2b+4w=18
b+w=7
Please help me and show your work thanks

1 1/2b+4w=18
(3/2)b + 4w = 18
times 2
3b + 8w = 36
equation #2 times 3
3b + 3w = 21
subtract them
5w = 15
w = 3
back into b+w=7
b+3=7
b=4
w=3, b=4
check::
1.5(4) + 4(3) = 18 , yeah
4+3=7, yeah 
1.5 b + 4 w = 18
b + w = 7 so w = (7b)
1.5 b + 4 (7b) = 18
1.5 b + 28  4 b = 18
10 = 2.5 b
b = 4
then
w = 3 
helo am spodermena dice