Question

Using substitution, what is the solution of the system?
y = 2x+7
y = x-1


a)(2 2/3,1 2/3)

b)(8,-9)

c)(-8,-9)

d)(1,0)

Answer 1

Since the two equations are solved for y, and in the first equation you see that y equals 2x + 7, insert 2x + 7 in for y in the second equation:
2x + 7 = x - 1
Solve for x:
x = -8
Now substitute this value of x into second original equation:
y = -8 - 1
y = -9
Solution: x = -8, y = -9

Answer 2

Thank you!!! @mathstudent55!!

Answer 3

wlcm