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2x - y = 1
4x - y - 5 = 0
4x - y = 5
4x - y = 5
2x - y = 1_ -
2x = 4
x = 4/2
x = 2
2x - y = 1
2(2) - y = 1
4 - y = 1
-y = 1 - 4
-y = -3
y = 3
ax - y - 7 = 0
a(2) - 3 - 7 = 0
2a - 10 = 0
2a = 10
a = 10/2
a = 5