Thursday

October 23, 2014

October 23, 2014

Posted by **ellis** on Tuesday, December 18, 2012 at 9:49pm.

3x-9=12

y^2-5y-11=13

- math exam tommrow review -
**Reiny**, Tuesday, December 18, 2012 at 9:55pm3x-9=12

3x = 12+9

3x = 21

x = 7 , which is a member of your solution set

y^2 - 5y - 11 = 13

y^2 - 5y - 24 - 0

(y-8)(x+3) = 0

y = 8 or y = -3

only y=8 is a solution, since -3 is not part of your solution set.

- math exam tommrow review -
**ellis**, Tuesday, December 18, 2012 at 9:57pmso i dont have to plug in each number?

- math exam tommrow review -
**Reiny**, Tuesday, December 18, 2012 at 10:16pmyes, you could do that.

I don't know what grade level you are at.

The second question involved solving a quadratic.

If you don't know what that is, then plugging in each value of the replacement set would be your way of doing it.

**Answer this Question**

**Related Questions**

math exam tommrow review - (5p-2)(-3)

math exam tommrow review - the ABC cell phone company offers a plan that ...

math exam tommrow review - twelve less than the product of 3 and a number . ...

math exam tommrow review - please check work. y=2x-85 plug in 130 for x and i ...

math exam tommrow review - hortartio is buying a computer cable for 15.49. if ...

math exam tommrow review - (2*4) with a exponet of 2 ------ 7+3 with a exponet ...

math exam tommrow review - an amusment park recorded attendence of 825000 one ...

math exam tommrow review - the mean score on a math test taken by 15 students ...

Science - I have a science exam tomorrow for 9 Space Science. I was wondering if...

advanced statistics - suppose the probability is 0.30 that a student taking an ...