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3 years ago

Need answers . Please help solve .

Mathematics

2 answers:

AysviL [449]3 years ago

6 0

2) -4
3) -2
4) 2
5) -1
6) no solution
7) 3.5
8) -1
9) -6

Savatey [412]3 years ago

5 0

Answers and Steps

2. -5x+4=-2x+16

-5x+2x+4=-2x+2x+16

-3x+4=16

Move +4 to the other side. Sign changes from +4 to -4.

-3x+4-4=16-4

-3x=12

Divide by -3

-3x/3=12/-3

x=-4

3. 3x+15-9=2(x+2)

Multiply the bracket by 2

3x+6=2x+4

3x-2x+6=2x-2x+4

x+6=4

x+6-6=4-6

x=-2

4. -2x-3=4x-15

-2x-4x-3=4x-4x-15

-6x-3=-15

-6x-3+3=-15+3

-6x=-12

Divide by -6

-6x/-6=-12/-6

x=2

5. 2x-3=-(4x+9)

Pretend that there is a -1 in front of the bracket

2x-3=-1(4x+9)

2x-3=-4x-9

2x+4x-3=-4x+4x-9

6x-3=-9

6x-3+3=-9+3

6x=-6

6x/6=-6/6

x=-1

6. 4(x+3)=3x+2+x

4x+3=3x+x+2

4x+3=4x+2

4x-4x+3-3=2-3

0=-1

No solution

7. 20-6x=4x-15

20+15-6x=4x-15+15

35-6x=4x

35-6x+6x=4x+6x

35=10x

35/10=10x/10

x=7/2 - divide by 5 .

7/2 as a decimal = 3.5

x=3.5

8. 5x-9=-3x-12+5x

5x-9=-3x+5x-12

5x+3x-9=-3x+3x+5x-12

8x-9=5x-12

8x-5x-9=5x-5x-12

3x-9=-12

3x-9+9=-12+9

3x=-3

3x/3=-3/3

x=-1

9. 2+2x-5=5(x+3)

2+2x-5=5x+15

-3+2x=5x+15

2x-5x-3+3=15+3

-3x=18

-3x/3=18/-3

x=-6

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