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January 31, 2015

January 31, 2015

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

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.

- Algebra (check answers) -
**Reiny**, Monday, April 27, 2009 at 6:23pmnone of your equation answers are correct.

I will #3 for you then follow the same method to do the rest

3. y=x+7

x+2y= -21

sub the first into the second:

x + 2(x+7) = -21

x + 2x + 14 = -21

3x = -35

x = -35/3

now sub that back into the first

y = -35/3 + 7 = -35/3 + 21/3 = -14/3

check:

in #1

LS = y = -14/3

RS = x+7 = -35/3 + 7 = -14/3

in #2

LS = x+2y = -35/3 + 2(-14/3) = -21

RS = -21

now work each one out the same way, and check your answer the same way.

- Please someone check this -
**Stacie**, Monday, April 27, 2009 at 6:23pmIf you know how to do this substitution let me know but if you don't that's okay. Also, the last one I redid I got 52:30

- Algebra (check answers) -
**terri**, Thursday, May 14, 2009 at 10:03amx-2y=-1 -x+5y=4 x=-1 y=1

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