Answer
Ordered pair solution $(2,8)$
Work Step by Step
We have $$(1) x+y=10$$ $$(2)y=4x$$
Substituting (2) in (1) $$x+4x = 10$$ $$5x=10$$ $$x=10\div5 = 2$$
Solving for $y$ $$y = 4*2 = 8$$
Ordered pair solution $(2,8)$
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