3 years ago

Solve.

Mathematics

2 answers:

lions [1.4K]3 years ago

6 0

Answer:

b=9,a=12

Step-by-step explanation:

I solved by substitution:

b = 3/4a ---> plug this into the other equation

a + b = 21 is now a + 3/4a = 21

Reduce: 7/4a = 21

a = 12

Now solve for b:

b=3/4a is now b=3/4(12)

b=9

Setler [38]3 years ago

6 0

Answer:

a=12 b= 9

Step-by-step explanation:

did the quiz

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