Question

Solve the following system of equations 4x + 5y = 5 and 8x +5y = 25

Answer 1

4x +  5y = 5  / (-1)
8x + 5y = 25

-4x - 5y = -5
8x + 5y = 25


-4x + 8x = -5 + 25
4x = 20
x = 5

4x +  5y = 5 
4*5 + 5y = 5
20 + 5y = 5 
5y = 5 - 20
5y = -15
y = -3


8x + 5y = 25
8 *5 + 5y = 25
40 + 5y = 25
5y = 25 - 40
5y = -15
y = -3