Question 1102116: twice the first number plus a second number is 42, and the first number minus the second number is -6. Find the number. Answer by ikleyn(52786) (Show Source):
2x + y = 42,
x - y = -6.
Add the two equations. You will get
3x = 42 - 6 = 36 ====> x = = 12.
Then from the second equation y = x + 6 = 12 + 6 = 18.
Answer. x= 12, y= 18.
