<PRE><B>Question 639953</B>

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


{{{highlight_green(x = 3)}}}


y = 2(3) - 4 ----- Substituting 3 for x in eq (ii)


y = 6 - 4


{{{highlight_green(y = 2)}}}


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