Respuesta :

Answer:

a=84/4 and b=3/4

Step-by-step explanation:

Use Substitution.

B= 3/4; a+b=21

Solve b= 3/4 for b:

b=3/4

Substitute 3/4 for b in a + b = 21:

a+b=21

a+3/4=21

a+3/4+-3/4=21+-3/4 (add (-3)/4 to both sides)

a=84/4

The value of "a" will be "[tex]\frac{81}{4}[/tex]".

Given expression is:

  • [tex]a+b = 21[/tex]
  • [tex]b = \frac{3}{4}[/tex]

By substituting the value of "b" in the given expression, we get

→ [tex]a + \frac{3}{4} = 21[/tex]

→       [tex]a = 21 - \frac{3}{4}[/tex]

By taking L.C.M, we get

             [tex]= \frac{84-3}{4}[/tex]

             [tex]= \frac{81}{4}[/tex]

Thus the response above is correct.

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