Question

solve the linear system using substitution.
4x-7y=10
y=x-7

Answer 1

http://www.wolframalpha.com/

Answer 2

They do step by step instructions on how to solve this! Far better instructions than whoever is going to help you.

Answer 3

ok

Answer 4

4x-7y=10 <---e1
y=x-7 <---- e2
y value is given so plug it into e1
\[\huge~\rm~4x−7(x−7)=10 \]
solve for x

Answer 5

you're welcome.

Answer 6

x=-13?
y=-20?

Answer 7

-20 is wrong

Answer 8

but i got -13 for my x value

Answer 9

didn't see the negative sign....try again

Answer 10

4x-7y=10 <---e1
y=x-7 <---- e2
y value is given so plug it into e1
\[\huge~\rm~4x−7(x−7)=10\]
solve for x

Answer 11

but -7*-7=49

Answer 12

4x-7x+49=10
go on from here

Answer 13

-3x=-39

Answer 14

oh i see. -x=-13, but I want the -x to be positive, so x=13

Answer 15

Correct :-)

now find the y value

Answer 16

y=6

Answer 17

Perfect! :)

Answer 18

Thank you @abb0t

Answer 19

You're very welcome @TheSmartOne

Answer 20

I got a 100% on my test, I can never repay you back for your service.