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Mathematics 12 Online
Cupcake123456:

9x+18+3x=1 ???????/

Cupcake123456:

@MrMudd183

MrMudd183:

i gotta work this one out

Cupcake123456:

ok

MrMudd183:

Cupcake, how do you want the problem solved?

Cupcake123456:

we gotta figure out what number =x

MrMudd183:

ok

Cupcake123456:

@Shadow

MrMudd183:

i use this to help me https://www.mathway.com/Algebra

Shadow:

Solve for x by isolating it, which is just getting x on one side of the equals sign \[x = ?\]

Shadow:

Let's begin with like terms. 9x + 3x = ?

Cupcake123456:

12? 9+3

Shadow:

\[9x + 3x = 12x\]

Shadow:

Therefore we can rewrite \[9x+18+3x=1\] as: \[12x + 18 = 1\]

Shadow:

We want x alone on one side. What do you think we should do next?

Cupcake123456:

1.41 ???????

Shadow:

That's not the next step..

Cupcake123456:

next step is the evaluate the 18 ?

Cupcake123456:

to -18?

Shadow:

Yes, subtract 18 from both sides.

Cupcake123456:

12x=17

Shadow:

Not quite

Shadow:

You're missing something.

Shadow:

Think of 1 on a number line. You went left, 18 places. That puts you, where?

Cupcake123456:

12/12x=17/12?

Shadow:

|dw:1556115759734:dw|

Shadow:

^my high effort number line

Shadow:

@Cupcake123456 ?

Cupcake123456:

ooookkkk...

Cupcake123456:

|dw:1556115931801:dw|

Shadow:

1 - 18 = -17

Cupcake123456:

yeah..

Shadow:

Then yes, divide by 12

Shadow:

And you're done

Shadow:

Just to be clear, 1.41 is incorrect.

Cupcake123456:

sooo whats the answer?

Cupcake123456:

-17 / 12?

Shadow:

Yes

Cupcake123456:

-1.41?

Shadow:

It depends on if your teacher wants a fraction or a decimal rounded to the hundredths place

Shadow:

-1.41 is the latter, whilst the former is -17/12

Cupcake123456:

she wants a decimal

Shadow:

k then go with that if that's the place she wants

Cupcake123456:

Ok thank u

Shadow:

No problem

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