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# How to solve this? [substitution method]  ​

• Réponse publiée par: princessgarcia23

1. x = 0, y = 4

2. x = -3, y = -5

Step-by-step explanation:

1. Substitute x by 4 - y

Now you have 2y + 4 = 12

Solve for y and you have y = 4

Substitute y and you have x = 0.

2. Substitute y by x - 2

Then you get 2x - 3(x-2) = 9 [Note: Distribute the negative sign]

After distributing you get -x + 6 = 9

Solve for x and you get x = -3 (Multiply -1 on both sides)

Substitute x now and y = -5

Hope this helps.

• Réponse publiée par: elaineeee
Margin fo error=z(sub a/2) * √(p*(1-p))/n

0.08=0.6736*√(0.25*(1-0.25))/n
n=(0.25*(1-0.25))/(0.08/0.6736)^2
n=13.2931

hope it helps you
• Réponse publiée par: kateclaire
All you have to do is use the triangle inequality theorem, which states that the sum of two side lengths of a triangle is always greater than the third side. if this is true for all three combinations of added side lengths, then you will have a triangle.
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How to solve this? [substitution method][tex]1. \\ x + 3y = 12 \\ x = 4 - y[/tex][tex]2. \\ 2x - 3y...