I need help with these two questions:
1. The quintuple of a number reduced by seven is equal to three times that number plus eleven. Look for that number.
2. The sum of the two numbers is 120, and their difference is 50. Which numbers are they?
1) 5x - 7 =3x + 7
5x - 3x =7 + 7
2x =14 divide both sides by 2
x = 7
2) a + b =120
a - b =50
a =85, b =35
1) 5x - 7 = 3x + 11 | - 3x
2x - 7 = 11 | + 7
2x = 18 | : 2
x = 9
2) x + y = 120 (1)
x - y = 50 | + y (2)
x = 50 + y
x in (1)
50 + y + y = 120
50 + 2y = 120 | - 50
2y = 70 | : 2
y = 35
y in (1)
x + 35 = 120 | - 35
x = 85
+18 
