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2 years ago

Why does -2(x + 3y) = 18 equal y=-3-x/3? Please helppp

Mathematics

2 answers:

Citrus2011 [14]2 years ago

8 0

Step-by-step explanation:

You're asking why

${- 2(x + 3y) = 18} = y = - 3 - \frac{x}{3}$

let's transpose the first equation for y

-2x-6y=18

-6y=18+2x

6y=-18-2x

y=-18/6-2x/6

y=-3-⅓x as required

White raven [17]2 years ago

8 0

For this I would isolate y from the beginning.

Heres how I would solve it:

-2(x + 3y) = 18 --> 18 divided by (-2) is (-9), so (x + 3y) must be equal to (-9)

x + 3y = -9 --> now I would begin to isolate for y:

3y = -9 -x

y = (-9-x) ÷ 3 --> dividing each term by 3 would give me:

y = -3 - x/3 --> x stays the same because it doesn't have a definite answer.

Hope this helps (〃▽〃)

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