CanadaW
CanadaW
08-05-2014
Mathematics
Answered
Solving for systems:
{y=3x+7 & y=5x-7
Answer :
Аноним
Аноним
09-05-2014
[tex]\left\{\begin{array}{ccc}y=3x+7\\y=5x-7\end{array}\right\\\\substitute:\\\\5x-7=3x+7\\5x-3x=7+7\\2x=14\ \ \ \ /:2\\x=7\\\\y=3\cdot7+7=21+7=28\\\\Answer:x=7\ and\ y=28.[/tex]
Answer Link
tadvisohil886
tadvisohil886
09-05-2014
y = 3x + 7
y = 5x-7
Now, we know that y = y
thus,
3x + 7 = 5x-7
3x - 5x = -7 -7
= -2x = -14
thus, -x = -14/-2
thus, x = 7.
Substituting for y,
y = 3x + 7
= 3 x 7 + 7
= 28.
Thus, x = 7, y =28
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