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I assume you mean this system.

Y - 4X = 10
Y = 2X - 6

You are given Y, so insert into top equation to find X.

(2X - 6) - 4X = 10

- 2X - 6 = 10

-2X = 16

X = - 8
===========find Y, bottom equation

Y = 2(- 8) - 6

Y = - 16 - 6

Y = - 22
=========
=== You try checking it.

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Q: What is the solutions for the equations y-4x 10 y2x-6?
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