Help me please!can somebody give me the answer than try to explain how they got it

4x - 7y = 19

4(-4) - 7(-5) = 19

-16 - (-35) = 19

-16 + 35 = 19

19 = 19

(-4,-5) is a solution to given equation.

4(9) - 7(6) = 19

36 - 42 = 19

-6 ≠ 19

(9,6) is not a solution to given equation.

4(1) - 7(-3) = 19

4 - (-21) = 19

4 + 21 = 19

25 ≠ 19

(1, -3) is not a solution to given equation.

4(-6) - 7(2) = 19

-24 - 14 = 19

-38 ≠ 19

(-6,2) is not a solution to given equation.

Note:- A solution to an equation is any value which when substituted to a variable would make the equation true.

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons