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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