Question

For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

x − y = 8
−x − y = −7

8 − y

−8 − y

8 + y

−8 + y

Answer 1

x - y = 8
add y to both sides

Answer 2

isolating the x, means moving all other constants and variables to the other side of the equation. This will leave you with x=...
They are asking what x= for the first equation, which you substitute into the second equation.

Answer 3

oh

Answer 4

x - y + y = 8 + y

can you simplify this

Answer 5

yes

Answer 6

part of it cancels right?

Answer 7

so which one of the choices is it?

Answer 8

8 + y

Answer 9

right

Answer 10

thank you

Answer 11

yw