Monday

April 21, 2014

April 21, 2014

Posted by **Anonymous** on Friday, December 21, 2012 at 3:08pm.

a. 3x – 3 = –4x

b. 2y + 4 – y = 16

c. 7x + 5 = 4x + 5 + 3x

d. 6y – 2 = 2(y – 1)

And please explain how I don't understand. Thanks sooooo much!!!

- Pre Algebra Help ASAP -
**bobpursley**, Friday, December 21, 2012 at 3:14pmlook at c. Why can't you solve for x, as in the others?

- Pre Algebra Help ASAP -
**Linda**, Friday, December 21, 2012 at 3:19pmThe reason the that C has an infinite number of solutions as opposed to the others is because you essentially have

7x +5 = 7x +5 (because you can add the

4x and 3x to make 7x so any answer will work because it will be the same answer on each side no matter what and the other problems will all end up with X = to something were as C would end up 0=0

- Pre Algebra Help ASAP -
**Bosnian**, Friday, December 21, 2012 at 3:34pma.

3 x – 3 = – 4 x Add 4x to both sides

3 x – 3 + 4 x = – 4 x 4 x

7 x - 3 = 0 Add 3 to bozh sides

7 x - 3 + 3 = 0 + 3

7 x = 3 Divide both sides by 7

x = 3 / 7

ONLY ONE SOLUTION

b.

2 y + 4 – y = 16

y + 4 = 16 Subtracr 4 to both sides

y + 4 - 4 = 16 - 4

y = 12

ONLY ONE SOLUTION

c.

7 x + 5 = 4 x + 5 + 3 x

7 x + 5 = 7 x + 5

THAT IS TRUE FOR ALL VALUES OF x.

INFINITE NUMBER OF SOLUTIONS

d.

6 y – 2 = 2 ( y – 1 ) Divide both sides by 2

3 y - 1 = y - 1 Subtract y to both sides

3 y - y - 1 = - y - 1 - y

2 y - 1 = - 1 Add 1 to both sides

2 y - 1 + 1 = - 1 + 1

2 y = 0 Divide both sides by 2

y = 0

ONLY ONE SOLUTION

CORRECT ANSWER :

c

**Related Questions**

pre- algebra(MATH) - I need help with pre-algebra solving equations by ...

Geometry :( - this maths problem is wrecking my head.... 1.find the points of ...

Pre-Calculus - If you solve the following system of equations by substitution, ...

algebra - what is the solution of the following system of equations? 2y + 3x = ...

pre-algebra - kk my teach told me to describe and draw things that are about pre...

pre-Algebra - How can you solve algebra equations? The idea is to find a way to ...

pre-algebra help - Determine which two equations represent perpendicular lines...

pre-algebra - how do i identify the slope snd y-intercept of the graph of each ...

pre-calc. - Answers for Determine The Minimum Distance From The Point (18,20) To...

7th pre-algebra - I need help understanding how to slove two step equations. ...