Question

The area of a rectangle is 84cm^2. The perimeter is 40cm find the dimensions.

Answer 1

xy = 84 --- 1

2y+2x = 40 ---2

Answer 2

Solve by substituion!

Answer 3

Area of rectangle=A=xy=84
P=2x+2y=40

Answer 4

xy=84
2x+2y=40=> x+y=20

Answer 5

do it the cool way! solve this quadratic equation:
\[p^2-20p+84 = 0\]

Answer 6

so 5 and 15

Answer 7

lol the cool way

Answer 8

@CabRamos youre close, but 15*5 doesnt equal 84, so thats not the correct answer >.<

Answer 9

y(x+y)=y(20)
xy+y^2=20y
y^2+xy-20y=0
y^2+84-20y=0
y^2-20y+84=0
(y-6)(y-14)=0

Answer 10

6 and 14 then?

Answer 11

nice :)

Answer 12

Thanks ha

Answer 13

gj!

Answer 14

could it also be 16 and 4?

Answer 15

yes that is correct too

Answer 16

cause both of those are options on my worksheet

Answer 17

16 and 4?
16(4) is not 84

Answer 18

whoops >.< 14 and 6. i got confused >.<

Answer 19

i thought he just switched the order >.< my bad my bad.

Answer 20

if y=6, then x=14
if y=14, then x=6

Answer 21

joe did u ever figure out the pool question?