X+y=28
xy=7
xy=7
divide both sides by x
y=7/x
sub 7/x for y in first equation
7/x+x=28
times both sides by x
7+x^2=28x
minus 28x from both sides
x^2-28x+7=0
use quadratic formula
if
ax^2+bx+c=0
x=
x=
x=
sub for y
y=7/x
y=
the reciprocals are
and
times first one by
and second by 7/7
evaluate the plus and minus yourself please, my head hurts
length = 32 and width = 5
let the width = w then length = 4w + 12
perimeter = 2 ( length + width )
= 2( 4w + 12 + w ) = 2( 5w + 12 ) = 10w + 24
perimeter = 74
solve 10w + 24 = 74
subtract 24 from both sides
10w = 74 - 24 = 50 ⇒ w = 5
width = 5 and length = (4 × 5) + 12 = 20 + 12 = 32
Answer: it’s sideways-
Step-by-step explanation: