If the line 2x-y-10 = 0 passes through the line 4x + 3y-10 = 0 and ax + 2Y + 8 = 0, then a= Detailed process online, thank you

If three straight lines meet at one point
2x-y-10=0,4x+3y-10=0
Intersection (4, - 2)
ax+2y+8=0
4a+2*-2+8=0
a=-1

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