Question

find the solutions to the system.
y = x^2 - 3x - 1
y=8x - 1
a. (0,-1) and (11,388)
b. (0,01) and (11,87)
c. (-1,0) and (87,11)
d. no solutions

Answer 1

do you have an idea of what to do?

Answer 2

no

Answer 3

so let's use substitution... since the y's have to be the same value (as do the x's) we can equate them and get an equation with only x's...

8x-1 = y = x^2 - 3x - 1 => 8x-1 = x^2 - 3x - 1

now you can move everything to one side and solve the quadratic

Answer 4

do you know how to solve?

Answer 5

no

Answer 6

subtract (8x-1) from both sides... what do you get?

Answer 7

what is x