A. If the perimeter of a rectangle is 20 ft and the width is 3 ft, find the length.
B. solve for x. 3x - 2y = 6
2007-03-23 09:57:18 · 29 answers · asked by Sweetie 2 in Education & Reference ➔ Homework Help
2 × width + 2 × length = perimeter
length = (perimeter - 2 × width) / 2
length = (20 feet – 2 × 3 feet) / 2
length = 7 feet
2007-03-23 09:59:24 · answer #1 · answered by ........ 5 · 0⤊ 0⤋
a. Seven-- in a rectangle each set of sides are equal. Width is 3. 3 x 2 (for the other side) = 6 20(Perimeter) - 6 = 14. 14 is added width of 2 remaining sides, which are equal so divide 14 by 2. 7! yay
b. x = 2/3y + 2
3x - 2y = 6
move 2y over by adding 2y to both sides
3x = 2y + 6
divide both sides by 3 to isolate x
x = 2/3y + 2
2007-03-23 10:04:44 · answer #2 · answered by Anonymous · 0⤊ 0⤋
A.) perimeter of a rectangle = 2(length+width)
Let length be x.
20 = 2(3+x)
3+x = 10
x = 10-3
x = 7
Length is 7 ft.
B.) 3x-2y = 6
3x = 6+2y
x = (6+2y)/3
x = 2 + (2/3)y
2007-03-23 10:08:04 · answer #3 · answered by gamma_wave 3 · 0⤊ 0⤋
You subtract the two 3 ft sides from the perimeter leaving 14. Then you split 14 in 2 giving 7 ft.
2007-03-23 10:00:33 · answer #4 · answered by Barkley Hound 7 · 0⤊ 0⤋
A. Length is 7 feet
B. You'd solve this equation for x as follows:
3x - 2y = 6
Now add 2y to each side of the equation.
3x = 6 + 2y
Now divide each side of the equation by 3.
x = 2 + (2/3)y
However, do they tell you what Y is equal to? Without knowing what Y is this is the best equation to give. I'd be able to help more if I knew what Y was. Being a teacher, I'd accept this answer. Good luck!!
2007-03-23 11:16:48 · answer #5 · answered by irishscrapper73 2 · 0⤊ 0⤋
A) A rectangle has 4 sides...2 lengths and 2 widths....P= 2L + 2w.Now substitute the information given into the equation.....20 = 2L + 6...solve for L......20 - 6 = 2L.....14 =2L...L= 7.
B) Add 2y to both sides of the equation. 3x -2y +2y =6 +2y.......3x = 6 + 2y......divide by 3....x = 2 + 2/3y
2007-03-23 10:10:34 · answer #6 · answered by dpirsq2 5 · 0⤊ 0⤋
A.
perimiter = 2*width + 2*length
20 = 2(3) + 2(length)
20 = 6 + 2L
14 = 2L
L = 7
check
20 = 2(3) + 2(7)
20 = 6 + 14
20 = 20
B.
3x - 2y = 6
3x = 6 + 2y
x = 2 + 2y/3
2007-03-23 10:03:52 · answer #7 · answered by Patrick 5 · 0⤊ 0⤋
what is this the 6th grade again???
2(w+l) = p or 2w + 2l = p
that means that a rectangle has 4 sides, two widths and two lengths add them up and you get p (perimeter)
so if you know your width and you know your perimeter your set.
p = 20
w = 3
l = ?
2(3+L) = 20
6 + 2L = 20
2L = 14
L = 7
so your width is 3 feet, two widths = 6 feet for your width.
your length is 7 feet, two lengths = 14 feet.
6ft + 14ft = 20 ft!
b)
haha figure that out on your own... aint hard.
2007-03-23 10:03:26 · answer #8 · answered by tangsausagees 3 · 0⤊ 0⤋
l=7
2007-03-23 10:00:24 · answer #9 · answered by cory m 2 · 0⤊ 0⤋
P = 2(l + w)
20 = 2(l + 3)
20 = 2l + 6
14 = 2l
7 = l
Length is 7 ft
3x - 2y = 6
3x = 2y + 6
x = 2/3y + 2
2007-03-23 10:01:58 · answer #10 · answered by Anonymous · 0⤊ 0⤋