Posted by Neil on Friday, September 24, 2010 at 1:59pm.
4x² - 7y² = 21 (eq1)
x² + 2y² = 99 (eq2)
--> eq1-4*eq2
-->
4x² - 7y² = 21 (eq1)
-4x² - 8y² =- 396 -4*(eq2)
___________________
-15y²=-375 (eq3)
--> y²=25 (eq4)
Back sub to get
x² + 2(25) = 99
--> x² =99-50
--> x² =49 (eq5)
x =(+/-)sqrt(49) (eq6)
###############
# x =(+/-)7 # (eq7)
###############
y =(+/-)sqrt(25) (eq8)
###############
# y =(+/-)5 # (eq9)
###############
You could also use Matrix Methods
Related Questions
Algebra 2 - Solve the system using any algebraic method. 22.)2x-5y=4 23.)5x+7y=...
algebra - 1)What is the 4x^2=y^2+8y+32 answer= either hyperbola or parabola 2)...
maths-algebra - solve these similtanious equations using an algebraic method 4x+...
Algebra - Solving system of linear equations by using the apropiate method name ...
Algebra - Checking a few answers to some algebra problems: 1.Find the slope of ...
College Algebra - Solve the system of equations. Then classify the system. 7x-7y...
quick question regarding equations - I know there are methods out there but what...
Algebra 2 - Can someone check my answers. Write the following equations in ...
Algebra1!Plz help I have test 2morrow!!! - so would the new eqaution be... 2x+8=...
Algebra - Is there a difference between solving a system of equations by the ...
For Further Reading
