Question

solve the system by substitution. 7x+2y=-49, 7x-2y=-77

Answer 1

Find the values of 7x from second equation first:

\[7x - 2y = -77\]
\[7x = 2y - 77\]

Just plug in this value in equation first in place of 7x there..

Answer 2

x=-9 and y=7. You can check your calculations with this info....on the explanation of waterineyes I think she meant to find the value of x in the second equation and then substitute it into the first equation....that should work....

Answer 3

Thank you :)