Question

Which ordered pair is a solution of this equation 5x - 7y = -23 (4,0) (1,4) (4,1) (0,4)

Answer 1

• B) (1 ; 4)

Explanation:

(4 ; 0)

5×4 - 7×0 = 20 - 0 = 0 (false)

(1 ; 4)

5×1 - 7×4 = 5 - 28 = - 23 (true)

(4 ; 1)

5×4 - 7×1 = 20 - 7 = 13 (false)

(0 ; 4)

5×0 - 7×4 = 0 - 28 = - 28 (false)