Question 412009
We'll do it both ways here...
Substitution method:
y=1500+20x
y=3000+10x
.
1500+20x=3000+10x
1500+10x=3000
10x=1500
x = 150
.
y=1500+20x
y=1500+20(150)
y=1500+3000
y=4500
.
.


Applying the elimination method to:
y=1500+20x
y=3000+10x
.
moving the x's to the left:
y-20x=1500
y-10x=3000
.
multiply the bottom equation by -1 to get add both together:
 y-20x=1500
-y+10x=-3000
---------------
-10x = -1500
x = 150
.
substitute into top equation to find y:
y=1500+20x
y=1500+20(150)
y=1500+3000
y=4500