distance walked --- x km
distance biked ----- 25-x km
4x + 12(25-x) = 3.75
solve for x
Luisa travels 25 km in 3 3 4 hours. She walks part of the way at 4 km/h and cycles the rest at 12 km/h. How far did she walk?
4 answers
I got 37.0313 using your equation
But in the text book the answer is 10km
How to work it out using linear equations
But in the text book the answer is 10km
How to work it out using linear equations
I was only on my second cup of coffee when I did this ....
equation should have been
x/4 + (25-x)/12 = 3.75
multiply by 12
3x + (25-x) = 45
3x + 25 - x = 45
2x = 20
x = 10
So she walked 10 km
by linear equations:
let the distance walked be x
let the distance biked by y
x + y = 25
x/4 + y/12 = 3.75
times 12
3x + y = 45
subtract them:
2x = 20
x = 10
So she walked 10 km
equation should have been
x/4 + (25-x)/12 = 3.75
multiply by 12
3x + (25-x) = 45
3x + 25 - x = 45
2x = 20
x = 10
So she walked 10 km
by linear equations:
let the distance walked be x
let the distance biked by y
x + y = 25
x/4 + y/12 = 3.75
times 12
3x + y = 45
subtract them:
2x = 20
x = 10
So she walked 10 km
this response sucks