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.

## Answer This Question

## Related Questions

- math - In the term 21y, what is ther literal coefficient? a. 2 b. 21 c. 21y d. y...
- Math - solve for 9x-21y=28 -9x+21y=21 in elimination method
- maths - 3x + 14y = 5xy 21y - x = 2xy kindly solve the pair of linear equation
- Calculus - Find the particular solution of the differential equation y'=(5x+21y...
- math - is this correct 7x+21y-7=7(x+3y-1)
- math - 7x+21y-7=x+3y-1 GCF 7
- math - factory completely 21y^2+38+5
- Geometry - What is y if 6y+1=21y+13
- Math - List the terms without changing the expression. 21x+21y
- math - Thanks for the answer Reiny, could you explain the way you solved the ...

More Related Questions