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May 24, 2015

Homework Help: Algebra (check answers)

Posted by Stacie on Monday, April 27, 2009 at 5:59pm.

Could you please check my answers we are using substitution to solve each system of equations. And at the end of every solution you are supposed to have an answer as a coordinate.

1. x=2y
x+y=3
Answer (1,2)

2. 2y=3
x-y=10
Answer: (10,10)

3. y=x+7
x+2y= -21
Answer: (-3,-4)

4. 2y=x
x-y=10
Answer: (6,1)

5. x+y=0
4x+4y=0
Answer: (0,0)

6. 2x-y=6
3x-5y=9
Answer: (3,0)

7. 4x-y= -6
y+2=x
Answer: (-8,30)

8. 4x-y= -3
Answer: (3,-6)

9. x-5y=11
3x+y=7
Answer: infinitely many

10. x-2y=5
3x-5y=8
Answer: (-1.75, -8.5)

11. Laura and Ji- Yong were jogging on a 10 mile path. Laura had a 2-mile head start on Ju- Yong. If Laura ran at an average rate of 5 miles per hour and Ji-Yong ran at an average rate of 8 miles per hour, how long would it take for Ji-Yong to catch up with Laura.
Answer: 4 miles.

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