Question

what is the answer of this question​

Answer 1

Answer:

a.x=y,y=x b.970,299

Step-by-step explanation:

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Answer 2

Answer:

(a) x = 12-3y / 4

y= 12-4x/3

(b)

Step-by-step explanation:

(a) Since this is a linear equation in two variables, we can solve only for one variable in terms of the other.

4x+3y=12

Solving for x,

4x=12-3y

=> x=12-3y/4

Solving for y,

3y=12-4x

y=12-4x/3

(b) (99)^3

can be written as (100-1)^3

Which is similar to (a-b)^3 where a=100 and b=1

Using (a-b)^3 = a^3-b^3-3ab(a-b)

(100-1)^3 = 100^3-1^3-3(100)(1)(100-1)

(100-1)^3= 1000000-1-300(99)

(100-1)^3= 99999-29700

=> (99)^3= 970299

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