7x+y=-3 2x=3y=-14 what is x what is y

(x, y) = (-1, 4)

We assume your two equations are ...

You can eliminate the y-variable by multiplying the first equation by 3 and adding the second.

  3(7x +y) +(2x -3y) = 3(-3) +(-14)

  23x = -23 . . . . . . . simplify

  x = -1 . . . . . . . . . . . divide by 23

  7(-1) + y = -3 . . . . . substitute for x in the first equation

  y = 4 . . . . . . . . . . . add 7

the value of v.w= -12.

step-by-step explanation:

we are given three vector r,v and w as:

r = < 5, -5, -2> ; v = < 2, -8, -8> ; w = < -2, 6, -5>

we know that r,v and w could also be represented as:

r=5i-5j-2k

v=2i-8j-8k

and w= -2i+6j-5k

where i,j and k are the unit vectors of x,y and z-axis respectively.

also we know that it has the following property:

i.i=1 ; j.j=1; k.k=1

and i.=j.i=i.k=k.i=j.k=k.j=0

i.e. when we multiply two vectors or we find it's dot product we need to only multiply the components of x coordinates with each other; y with each other and z with each other.

hence, v.w= (2i-8j- -2i+6j-5k)

                  = 2×(-2)+(-8)×(6)+(-8)×(-5)

                  = -4-48+40

                  = -12

hence, v.w= -12

3.how is solving radical equations different than solving linear equations?

step-by-step explanation: