Question

Which ordered pair in the form (a, b) is a solution of this equation?

3a – 4b = 21


A.
(–3, –2)

B.
(0, 7)

C.
(7, 0)

D.
(–2, –3)

Answer 1

c - (7,0) because 3x7= 21 add 4x0 = 0 which then equals 21 :)

Answer 2

C. (7, 0)

Explanation:

Here, the given equation,

`3a-4b=21`

The order pair ( in which first value shows a and second value shows b ) that satisfies the given equation is called the solution of the equation,

For (-3, -2)

3(-3) - 4(-2) = 21 ( False )

For (0, 7),

3(0) - 4(7) = 21 ( False )

For (7,0),

3(7) - 4(0) = 21 ( True )

For (-2, -3),

3(-2) - 4(-3) = 21 ( False )

Thus, only (7,0) is the solution of the given equation,

Option 'C' is correct.