Question 28923
Let baseball be x
Let football be y
Let soccerball be z


First equation: x+y=1.25
Second equation: x+z=1.35
Third equation: z+y=1.9

<P>
Solve for y in the first equation:
<font color =green>y=1.25-x</font> (subsitution)


Apply subsitution in the third equation:
z+1.25-x=1.9
z-x=0.65 (set 1)
add set 1 to second equation:


<font color = purple>z-x=0.65</font>
x+z=1.35
--------
2z=2


z=1 


<font color = purple>1-x=0.65</font>
x=0.35

<P>
<font color = green>y=1.25-0.35</font>
y=0.9


Hence, a baseball weights 0.35 pounds, a football weights 0.9 pounds and a soccer ball weights 1 pound.
Paul.