Seudónimo Seudónimo

18-11-2020
Mathematics

contestada

Solve.
3
b=-a
4
a + b = 21
a = 375
a = 20
b = 11
a = 12
b = 9
a = 20
b = 15
b = -16
167

Solve 3 ba 4 a b 21 a 375 a 20 b 11 a 12 b 9 a 20 b 15 b 16 167 class=

Respuesta :

lydiahon lydiahon

18-11-2020

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

Answer Link

lissytrujillo15 lissytrujillo15

22-11-2020

Answer:

a=12 b= 9

Step-by-step explanation:

did the quiz

Answer Link

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