Solve the following linear system of equations using substitution. y = 3x – 5 y = 2x – 6 (3, 2) (–5, –6) (–1, –8) (1, –2)

( - 1, - 8 )

since both equations give y in terms of x we can equate them

3x - 5 = 2x - 6

subtract 2x from both sides of the equation

3x - 2x - 5 = - 6

x - 5 = - 6

add 5 to both sides

x = - 6 + 5 = - 1

substitute x = - 1 into either of the 2 equations for y

y = (3 × - 1) - 5 = - 3 - 5 = - 8

solution to the system is (- 1, - 8 )

on friday there were 15 birds

you can't solve x because it is 2 linear equation and you only have one equation