Asked by LadyPhantomhive

Help with solving systems using substitution?
Answered by Ms. Sue
http://www.regentsprep.org/regents/math/algebra/ae3/algsys.htm
Answered by LadyPhantomhive
Awesome so can we walk through this one question on my practice sheet?
x+y=8
y=3x
a.(4,12)
b. (2,6)
c. (1/2,3/2)
d. (-4, -12)
Answered by LadyPhantomhive
Wait I think it is B.Is that correct?
Answered by Ms. Sue
Yes, b is right.
Answered by Damon
so instead of y in the first equation you substitute 3 x

x + 3 x = 8
4 x = 8
x = 2
now go back and get y
y = 3 x = 3*2 = 6
so
(2,6)
yes, b
Answered by LadyPhantomhive
Great! Thanks Damon, and thank you Ms.Sue!
Answered by Ms. Sue
You're welcome, Lady.
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