The equation 5 x minus 10 y = 30 is written in standard form. What is the first step when solving for x? Add 5x to both sides of the equation.
Subtract 5x from both sides of the equation.
Add 10y to both sides of the equation.
Subtract 10y from both sides of the equation.

C) Add 10y to both sides of the equation

Step-by-step explanation:

We need to get x by itself.

So to make the 10y go to the other side, we add 10y to cancel it on the left, but move it to the right.

The equation now looks like this:

5x = 30 + 10y

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the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents

it would open into a square depending on the type of envelope i’m not sure about the second part