Question

Twice a first number decreased by a second number is negative 11. the first number increased by four times the second number is negative 1. find the numbers.

Answer 1

Answer: First Number = -5,  Second Number = 1


x = first number
y = second number

║ 2x - y = -11
║ x + 4y = -1

║ 2x - y = -11
║ 2x + 8y = -2

(2x + 8y = -2) - (2x - y = -11)

9y = 9
y = 1              <<<<<< We found y

Plug y = 1 into 2x - y = -11
2x - 1 = -11
2x = -10
x = -5            <<<<<< We found x