Use the substitution method to solve the system of equations below.
y = 3x
-2x + 8y = -22
x = 1
y = -3
x = -1
y = 3
x = -1
y = -3
x = 1
y = 3

Step-by-step explanation:

Since you have an expression for y, it is convenient to use it.

  -2x + 8(3x) = -22 . . . . . substitute 3x for y in the second equation

  22x = -22 . . . . . simplify

  x = -1 . . . . . . . . . .divide by 22

Substituting this value into the expression for y:

  y = 3(-1) = -3

The solution is (x, y) = (-1, -3).

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )

answer:

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21  

-7 + ? = 21

-7 + 28 = 21

hope it