Variable c is 5 more than variable a. Variable c is also 3 less than variable a. Which pair of equations best models the relationship between c and a?
c = a − 5
c = a + 3
a = c + 5
a = 3c − 3
a = c − 5
a = 3c + 3
c = a + 5
c = a − 3
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Variable c is 5 more than variable a
to change that into "math"
you can think of "is" as meaning =
so we can change
"Variable c is"
now for the rest: : 5 more than variable a
to figure this out, do you know what 5 more than 1 is ?
Not the answer you are looking for? Search for more explanations.
and 5 more than 2 is 7
how do you get 7 from 5 and 2. what do you do?
the idea is to learn these tricks on how to translate the English to math.
you know 5 more than 1 is 6
but how did you get 6?
and how do you write 5 added to 1 ?
5 + 1
now we use letters, but the same idea
5 more than a
in which case you get
for the first equation
it looks like the only choice with that equation is D
we don't have to check the other equation, but it would be helpful
(may as learn how to do this)
Variable c is also 3 less than variable a.
to get the idea, I would first use a number for "a"
3 less than 4 is 1
3 less than 5 is 2
so it looks like we are doing 4-3 or 5-3
or using "a"
and the 2nd equation is
which again is choice D
I already knew that I just wanted someone else's opinion. Thanks either way. :]