Question

solve for A and S for the system
a+s=700
10a+7s=5650

Answer 1

You can use the first equation to build a substitution for a or s, do you know how?

Answer 2

a+s=700
10a+7s=5650

-10a+-10s=-7000
10a+7s=5650

-3s=-1240
s= some random number that i'm sure is wrong.

this is what i've done so far

Answer 3

You id a good job on everything up to 5650-7000 :) its -1350

Answer 4

You see, when I did that out the first time I got the -1350 but then this happened
-3s=-1350
s=450

a+(450)=700
a= 240


so I added 240 to the 450 to see if it added up to 700, and obviously it added up to 690. I made a mistake in writing it out:/

Thank you so much for helping me see that. Is it possible you could help me with another question? It's very similar to this one.

Answer 5

Probably, go ahead and post it.

Answer 6

Just going to warn you, theres a 70% probability I miswrote something and that screwed up my whole answer- this happens alot.

Answer 7

x+y=900
10x+5y=6850

-5x+-5y=-4500
10x+5y=6850

10x= 2350
x=235


(235)+y=900
y=655

655+235=890

Answer 8

-5x+-5y=-4500
10x+5y=6850

10x= 2350
check the coefficient on the x again.

Answer 9

oh. thank you(:

Answer 10

You've got the right ideas, just be really careful. Your best ally in math is going slow and being careful. You'll always spend less time that way, in the long run. Plus it's far less frustrating. See you!

Answer 11

Thanks!