Posted by **SAP** on Thursday, September 30, 2010 at 10:00pm.

4x+5y=27

x=26-4y

4(26-4y) + 5y = 27

104 - 16y+ 5y = 27

-21y = - 77

21y = 77

y = 77/31

Now, I’m suppose to return to the 2nd equation x=26-4y and substitute 77/31 for x, I don’t understand if the is correct way or how to get the answer for the ordered pair.

- math need asap -
**Jen**, Thursday, September 30, 2010 at 10:05pm
-16y+5y=-11y, not -21y..I think that's your mistake

- math need asap -
**Ana Cecilia**, Thursday, September 30, 2010 at 10:14pm
the answer is x= -2 and y= 7, this is how its done

4(26-4y)+5= 27

104-16y+5y=27

104-11y=27

-11y=-77

y= 7

then you plug in the y for the next equation

4x+5(7)=27

4x+35=27

4x=-8

x=-2

and thats how you get your x and y i hope that helped

- math need asap -
**SAP**, Thursday, September 30, 2010 at 10:21pm
Ok, so if I use the corrected number you gave, that would make y = 7.

Returning to the 2nd equation x=26-4y and substituting x for 7.

4y = 7 - 26

still does not add up, what am I doing wrong?

- math need asap -
**SAP**, Thursday, September 30, 2010 at 10:29pm
Ana, thank you, now I understand what I was doing wrong. I couldn't figure out how to rewrite the x=26-4y equation.

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