tcuff2002 tcuff2002

26-01-2017
Mathematics

contestada

5x+y=27 y=4x using substitution method

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LukesTuke LukesTuke

26-01-2017

5x + y = 27
substitute: 5x + 4x = 27
combine: 9x = 27
divide (by 9): x = 3

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Apocrophon Apocrophon

26-01-2017

Substitute 4x for y, and solve for x;
5x + (4x) = 27
9x = 27
x = 3
Substitute 3 in for x in the first equation and solve for y;
5(3) + y = 27
15 + y = 27
y = 12

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