The sum of two numbers is 42. one number is 20 more than the other. find the numbers.

X and y being variables set for #1 and #2,

x + y = 42
x = y + 20

The second equation gives (x) a value, so you substitute its value in the first equation.

x + y = 42
(y + 20) + y = 42
2y + 20 = 42
- 20 -20
2y = 22
__ __
2 2
y = 11

Substitute y in the second equation

x = 11 + 20
x = 31

Answer : 31 and 11

Number nine is f(x)= 40x : ) hoped i ya

14 estimated and 13.62 exacti’m pretty sure..