If you could do question 9 I would be so thankful. Use substitution. No one is helping me, please help

step 1. x = 2y - 4 on the 1st equation

step 2. 5(2y- 4) - 6y +18 = 0 plug x from 1st equation into the 2nd equation

step 3. 10y - 20 - 6y + 18 = 0

step 4. 4y - 2 = 0

step 5. y = 1/2

step 6. x = -3 plug y into 1st equation

step 7. (-3, 1/2) is the answer.

-3*(x-2y+4=0)

5x-6y+18=0

-3x+6y-12y=-3

5x-6y+18=0

2x+6=-3

2x=-9

X= -4.5

Step-by-step explanation:

answer:

the position of equilibrium will shift to the left.

step-by-step explanation:

the general equation for the dissociation of a weak base is

b + h₂o   ⇌   bh⁺ + oh⁻

according to le châtelier's principle, when a stress is applied to a system at equilibrium, the system will respond in a way that tends to relieve the stress.

if you apply a stress by adding more bh⁺ or oh⁻,   the system will respond by moving in a direction that gets rid of the added ions.

the position of equilibrium will shift to the left, forming more of the undissociated base.

it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

step-by-step explanation:

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