SOLUTION: How to solve the following: 3x-y =7 when y=2x-4 Thank you
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Question 639953
:
How to solve the following:
3x-y =7 when y=2x-4
Thank you
Found 2 solutions by
jim_thompson5910, MathTherapy
:
Answer by
jim_thompson5910(35256)
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put this solution on YOUR website!
Hint: Since y = 2x-4, you can replace the
y
in the first equation with
2x-4
3x-y =7
3x-(y) =7
3x-(
y
) =7
3x-(
2x-4
) =7
3x-(2x-4) = 7
I'll let you take it from here.
Answer by
MathTherapy(10555)
(
Show Source
):
You can
put this solution on YOUR website!
How to solve the following:
3x-y =7 when y=2x-4
Thank you
3x - y = 7 ----- eq (i)
y = 2x - 4 ----- eq (ii)
3x - (2x - 4) = 7 ---- Substituting 2x - 4 for y in eq (i)
3x - 2x + 4 = 7
x = 7 - 4
y = 2(3) - 4 ----- Substituting 3 for x in eq (ii)
y = 6 - 4
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