Kali W.

asked • 10/11/17

What is -2x+3y=9? I'm solving for y. My teacher says it's literal equations.

-2x+3y=9      z-c/c=d

Arturo O.

What is a "literal equation"?  I think you meant to say "linear equation".
 
The equation 
 
(z-c)/c = d
 
is irrelevant to solving for y.  Mark gave you the solution for y in terms of x, which is all you can get without a second, independent linear equation in x and y.
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10/11/17

Mark M.

tutor
A literal equation is an equation that involves two or more variables.  So, the given equation is both linear and literal.  
 
Mark M (Bayport, NY)
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10/11/17

Arturo O.

I never heard that term, but I take your word for it.
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10/11/17

Kali W.

I'm sorry I meant z-y/c=dc
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10/11/17

1 Expert Answer

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Mark M. answered • 10/11/17

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-2x + 3y = 9
3y = 2x + 9     add 2x to both sides
y = 2x/3 + 3   divide both sides by 3
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Arturo O.

Mark,
 
The student just changed the problem (see last comment above), so now we need y(x,z)!
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10/11/17

Mark M.

Arturo, thank you for the explanation.
Mark M. L'autre
 
P.S.
To my knowledge, perhaps limited, "literal" only means containing letters (variables).
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10/11/17

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