Question

If guppies cost .20 less than swordtails, and three guppies and four swordtails cost $2.83, how much do guppies cost?

Answer 1

i think you mean $283 , anyways ,

let guppies be x and swordtail be y
so
y -x = 20
and
3x+4y = 283

so x = $29 and y= $49

Answer 2

When you solve the equation... 7xy = 283, so 283/7=40...Where did you get 29 & 49?