x + y =20
5x -1y =70
x = # correct y + # wrong.
add the two equations together since the y's will cancel.
6x = 90
x = 15 correct
how many are wrong?
On a 20 question math test, your teacher gives you five points for every correct answer and takes away one point for each incorrect answer. If you score 70 on the test, how many did you get correct?
1 answer