<PRE><B>Question 926751</B>
x = distance driven at 100 kph
y = time driven at 100 kph
---
s = d/t
t = d/s
---
y = x/100
2.25 - y = (210 - x)/80
---
100y = x
80*2.25 - 80y = 210 - x
---
put the system of linear equations into standard form
---
100y = x
180 - 80y = 210 - x
---
x - 100y = 0
x + 180 - 80y = 210
---
x - 100y = 0
x - 80y = 30
---
copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
---
solution:
x = distance driven at 100 kph = 150 km
y = time driven at 100 kph = 1.5 hours
---
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</PRE>