SOLUTION: Paul earns $4 an hour working at the library and $8 an hour mowing lawns. this week he worked 25 hours and earned $164. how many hours did he work at the library?

Question 828688: Paul earns $4 an hour working at the library and $8 an hour mowing lawns. this week he worked 25 hours and earned $164. how many hours did he work at the library?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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x = hours at library
y = hours on lawns
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x + y = 25
4x + 8y = 164
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copy and paste the above linear system in standard form into this matrix-method solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
---
solution:
x = hours at library = 9
y = hours on lawns = 16
---
Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
---
Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
---
Solve systems of linear equations up to 6-equations 6-variables:
https://sooeet.com/math/system-of-linear-equations-solver.php
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