contestada

You are given that
6a-2b = 8
(1)
a) Write down the value of 3a - b
b) Write down the value of 2b - 6a
-
6a-2b = 8
and
a + c = 5
c) You are given that
Find the value of
13a-4b + c

Respuesta :

dammyzee

Answer:

a) 4

b) -8

c) 21

Step-by-step explanation:

a) 6a-2b=8

2(3a-b)=8

3a-b=4

b) -2b+6a=8

multiply all through by minus

-(-2b +6a)= -8

2b-6a= -8

c) 6a-2b=8

2(3a-b)=8

divide both sides by 2

3a-b=4

-b =4-3a

multiply both sides by minus

-(-b) = -(4-3a)

b= -4+3a

b=3a-4

a+c=5

c=5-a

13a-4b + c

13a - 4(3a-4) + (5-a)

13a - 12a +16 +5 -a

13a-12a-a+16+5

13a-13a+21

=21

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