Question

if 3x+2y=1 & 2x+3y=4 then x+y must be?

Answer 1

first find x and y by using substitution, subtraction or matrix :)

Answer 2

i.e. solve for \(x\) and \(y\) then add them
you know how to do that?

Answer 3

yes

Answer 4

you can almost do this one in your head

Answer 5

ok good
let me know what you get

Answer 6

i get 1@satellite73

Answer 7

for the sum, yes
\[x=-1,y=2,-1+2=1\]

Answer 8

yes i was getting the same:) ty

Answer 9

yw

Answer 10

a circle is tangent to both axis if the distance from the origin to the centree of circle is r what is the area of the circle? @satellite73

Answer 11

hmm now i have to think, it is geometry

Answer 12

you wan the radius of the circle, which may or may not be obvious, but it is
\[\frac{r}{\sqrt2}\]

Answer 13

then the area is
\[\pi\left(\frac{r}{\sqrt2}\right)^2\]

Answer 14

why u writ radius of circle as \[r/\sqrt{2}\]

Answer 15

you got a right triangle there with two 45 degree angles

Answer 16

that means means the leg of the triangle is \(\frac{r}{\sqrt2}\)

Answer 17

have you had trig yet, or not
we can do it without trig if you like

Answer 18

it must be than rsqrt2?

Answer 19

i studied trignometry

Answer 20

the confusing part is that the radius is not \(r\) it is the leg of the triangle

Answer 21

but to get the leg, you have to divide the hypotenuse by \(\sqrt2\)

Answer 22

ok in right angle the hypotnuse is xsqrt2

Answer 23

right
but you have the hypotenuse is r, so the leg is \(\frac{r}{\sqrt2}\)

Answer 24

it must be then

Answer 25

yeah
so