Question

On your own paper, graph the system of equations and identify the solution.

x-y=1
5x-4y=0

A:(2,1)
B:(-4,-5)
C:(1,2)
D:(-5,-4)
E: No solution

Answer 1

x - y = 1....multiply by -5
5x - 4y = 0
---------------
-5x + 5y = -5 (result of multiplying by -5)
5x - 4y = 0
---------------add
y = -5

x - y = 1
x - (-5) = 1
x + 5 = 1
x = 1 - 5
x = -4

solution is (-4,-5)