What is the solution to the system of equation?

y = 1.5x - 4

y = - x

We can solve this by using substitution method:

instead of y put - x in the first equation:

y = 1.5x - 4 = > - x = 1.5x - 4

-x + x = 1.5x - 4 + x

0 = 2.5x - 4

0 + 4 = 2.5x - 4 + 4

2.5x = 4

x = 4/2.5

x = 1.6 and y = - 1.6

y = 1.5x - 4

y = - x

replace y = - x into y = 1.5x - 4

y = 1.5x - 4

-x = 1.5x - 4

1.5x + x = 4

2.5x = 4

x = 1.6

y = - x

y = - 1.6

answer: (1.6, - 1.6) is the solution