Check this please

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latresa31s

Junior Member
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Sep 4, 2005
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Complete the ordered pairs so that each is a solution to the given linear equation. Present your answer as an ordered pair.
y = 2x + 7
(a) (0, ?) (b) (4, ?)

Y= 2(0) + 7

Y= 0 + 7

y = 7

y=2(4) +7

y = 8 + 7

y= 15

a) (0, 7)

b) (4, 15)
 
Looks good to me! (And THANK YOU for showing your work!!)

:D

Eliz.
 
How about this one.

Complete the ordered pairs so that each is a solution to the given linear equation. Present your answer as an ordered pair.
3x – 7y = 30
(a) (3, ?) (b) (? , 3)


3x - 7y = 30

3(3) - 7y = 30

9x - 7y = 30

y = 37



3x - 7y = 30

3x - 7(3) = 30

3x - 21y = 30

x = 51
 
3x - 7y = 30

3(3) - 7y = 30

Ok to here, then should be

9 - 7y = 30

- 7y = 21

-y = 3

y = -3

(3, -3)


b, is incorrect also try, again from here


3x - 21 = 30
 
3x - 7y = 30

3x - 7(3) = 30

3x - 21y = 30

3x = 9

x = 3

( 3, 3)


on the first problem How did you get 21 I have tired to multiply, add and divide and still didn't get 21
 
Why did you go from "3x - 21 = 30" to "x = 51"? What happened to the "3"?

Why did you go from "3x - 21 = 30" to "3x = 9"? How did you get that 30 + 21 equalled 9?

Eliz.
 
stapel said:
Why did you go from "3x - 21 = 30" to "x = 51"? What happened to the "3"?
Why did you go from "3x - 21 = 30" to "3x = 9"? How did you get that 30 + 21 equalled 9?

Eliz.
Click to expand...


I did -21 + 30 and it was 9

I just forgot to add the three
 
If you subtract twenty-one from each side, you'll end up with "3x - 42 = 9".

Eliz.
 
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