Question 822256
---
x + y = 80
5x + 25y = 1460
---
first, solve by matrix method:
---
copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
---
answer:
x= nickels = 27
y= quarters = 53
---
now solve by elimination, to check the answer:
---
-5x - 5y = -400
5x + 25y = 1460
---
add:
20y = 1060
---
answer (same as the matrix method answer):
x = nickels = 27
y = quarters = 53
---
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