Math People- Help, Urgent!

**Legolas** · 03-15-2004, 02:07 AM

i am solving a set of simlutaneous equations. they are as follows:

[SIZE=14] x[SIZE=1] 2[SIZE=14] +4y[SIZE=1] 2[SIZE=14] =16
[SIZE=14] xy=4

the small numbers indicate exponents. i have two of these for my math hw, but for now, if anyone knows how to solve this one, pleasse help, fast

edit- this isnt coming out right, so in words-

x squared + 4y squared= 16
xy=4

help please

**Cheese** · 03-15-2004, 02:09 AM

Originally posted by Legolas@15 March 2004 - 01:07
i am solving a set of simlutaneous equations. they are as follows:

[SIZE=14] x[SIZE=1] 2[SIZE=14] +4y[SIZE=1] 2[SIZE=14] =16
[SIZE=14] xy=4

the small numbers indicate exponents. i have two of these for my math hw, but for now, if anyone knows how to solve this one, pleasse help, fast

That does look quite complicated...what does S stand for?

**4play** · 03-15-2004, 02:12 AM

x^2 +4y^2 = 16
xy = 4

is that what you meant to do?

looks like there will be more then one answer to that question try taking the square root of the top equation and it should be alot more simple.

**Legolas** · 03-15-2004, 02:13 AM

2 2
x+ 4y = 16
xy=4

**Legolas** · 03-15-2004, 02:14 AM

4play, yes that is what i meant. it will have 2 answers for x and 2 answers for y, according to the exponent number

**J'Pol** · 03-15-2004, 02:14 AM

FFS if xy=4 then one of them is 1 and one is 4.

Work the rest out.

**Legolas** · 03-15-2004, 02:15 AM

my math teacher doesnt like logic, so does anyone know how to solve using substitution? (solve for a variable in one equation and substitute the value into the second equation)