Use substitution or elimination

y=-2x - 6
y = x +9

(-5, 4)

Step-by-step explanation:

Step 1: Substitute−2x−6for y in y=x+9:

y=x+9

−2x−6=x+9

−2x−6+−x=x+9+−x( Add -x to both sides)

−3x−6=9

−3x−6+6=9+6 (Add 6 to both sides)

−3x=15

−3x

−3

=

15

−3

(Divide both sides by -3)

x=−5

Step 2: Substitute−5 for x in y=−2x−6:

y=−2x−6

y=(−2)(−5)−6

y=4 (Simplify both sides of the equation)

Answer in Equation Form:

x=−5  

y=4

Answer in Point Form:

(-5, 4)

y=12

Step-by-step explanation:

elimination method

y=-2x -6

y=x•2 +9•2

rewrite problems

y=-2x -6

y=2x + 18

the positive and negative 2x cancels out so you are left with y=12

3, 12, 48, 384, 1536, 6144, 24576, 98304

step-by-step explanation:

just keep timing it by 4.