Question 1033101
x = how much Joshua had
y = how much Jason had
z = how much George had

Please help me solve 

Joshua had a $150 more than Jason... 

x = y+150

and (Joshua had) $70 less than George 

x = z-70

the three boys had a total of $790 

x+y+z = 790

We have the system:

{{{system(x = y+150,x = z-70,x+y+z = 790)}}}

Solve 1st for y:  y = x-150
Solve 2nd for z:  z = x+70

Substitute those for x and y in the 3rd equation.

You finish.

Edwin</pre>