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Mathematics
Guest
15 September, 15:37
I don't know how to do this
Y=x-7
3x-3y=21
+3
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1
)
Gretchen Murphy
15 September, 19:23
0
You're going to use the substitution method for this.
First, we know that Y = x-7, so we can plug x-7 into everywhere we see Y!
3x - 3 (x - 7) = 21
then we simplify
3x - 3x + 21 = 21
^ ^
These cancel out!
So we're left with ...
21 = 21
That means that the solution to this equation is all real numbers!
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