Solve by the expulsion method.?

5x+2y=15
7x-3y=11
Answers:
5x+2y=15
7x-3y=11

We'll eliminate the y.

3(5x+2y)=(15)(3)

(2)(7x-3y)=(11)(2)
_________________________

15x + 6y = 45
14x - 6y = 22

By Addition:

29x = 67
x = 67/29 or 2.31

Substitute this for x in either of your initial equations to solve for y.

5(2.31)+2y=15
y = 1.725
7x=11+3y
x=(11+3y)/7

5*(11+3y)/7+2y=15
(55+15y)/7+2y=15
55/7+15/7y+2y=15
29/7y=15-55/7
y=105/29-55/29
y=60/29 = 2.06897

5x+2*60/29=15
5x=15-120/29
x=3-24/29
x=63/29 = 2.17241

Related Questions:
Ekg and bunch of blood oral exam?   5. A doctor have established to prescribe two different drugs to 200 heart patients as follows,?   How is the Nipah virus different from the Swine flu virus?   Is it possible to finish Med-school surrounded by 3 years?   I hold to hold surgery........?  
  • Please report to me which antihistamine is the best for not rising blood pressure.?
  • Why the color of our urine become so yellowish after taking Vitamin B Complex?
  • What does Cx stand for contained by Medicine?