Which ordered pair in the form (a, b) is a solution of this equation?
3a – 4b = 21









A.

(–2, –3)








B.

(0, 7)








C.

(–3, –2)








D.

(7, 0)

Respuesta :

3a - 4b = 21


check (-2 , -3)


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


-6 +12  = 21


6 does not = 21  so NO


check (0 , 7)


3(0) -4(7) =21


0-28=21


-28 does not equal 21  so NO


check (-3 , -2)


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


-9 +8  = 21


1 does not = 21  so NO


check (7 , 0)


3(7) -4(0) =21


21  = 21

Choice D