SOLUTION: How to solve this equation 5y+x=40 y=3x+40 with substitution

Question 820980: How to solve this equation 5y+x=40 y=3x+40 with substitution
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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5y + x = 40
y = 3x + 40
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put the system of linear equations into standard form
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x + 5y = 40
3x - y = -40
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copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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answer:
x= -10
y= 10
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