What is the answer to
[x+3y=5
[2x-y=-4

x + 3y = 5 => x = 5 - 3y

2x - y = -4

Subs x

2.(5 - 3y) - y = -4

10 - 6y - y = -4

10 - 7y = - 4

10 + 4 = 7y

y = 14/7

y = 2

Subs y

2x - y = -4

2x - 2 = -4

2x = -4 + 2

2x = -2

x = -2/2

x = -1

51

step-by-step explanation:

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

(3x-8) or (3x+8)

step-by-step explanation: