Equation A=5/4 x = 2 +1/4 x B=-1/2x+5=3/2x+9 C=7/3(x+3)=9 D=3/4(4-x)=-2 A=x/x+2=3/5 B=x/x+4=7/9 C=3/4=x/x+5 D=7/7+x=2/5

Bonjour,

Equation

A=5/4 x = 2 +1/4 x

5/4 x - 1/4 x = 2

4/4 x = 2

x = 2

B=-1/2x+5=3/2x+9

5 - 9 = 3/2 x + 1/2 x

-4 = 4/2 x

-4 = 2x

x = -4/2 = -2

C=7/3(x+3)=9

7/3 x + 7 = 9

7/3 x = 9 - 7

7/3 x = 2

x = 2 * 3/7 = 6/7

D=3/4(4-x)=-2

3 - 3/4 x = -2

3 + 2 = 3/4 x

5 = 3/4 x

x = 5 * 4/3 = 20/3

A=x/x+2=3/5

[tex]x + 2 \ne 0[/tex]

[tex]x \ne -2[/tex]

5x = 3(x + 2)

5x = 3x + 6

5x - 3x = 6

2x = 6

x = 6/2

x = 3

B=x/x+4=7/9

[tex]x + 4 \ne 0[/tex]

[tex]x \ne -4[/tex]

9x = 7(x + 4)

9x = 7x + 28

9x - 7x = 28

2x = 28

x = 28/2

x = 14

C=3/4=x/x+5

[tex]x + 5 \ne 0[/tex]

[tex]x \ne -5[/tex]

3(x + 5) = 4x

3x + 15 = 4x

15 = 4x - 3x

x = 15

D=7/7+x=2/5

[tex]x + 7 \ne 0[/tex]

[tex]x \ne -7[/tex]

7 * 5 = 2(7 + x)

35 = 14 + 2x

2x = 35 - 14

x = 21/2

x = 10,5