Question

Solve the system by substitution.- 3x – 10 = y-2 - 8y = 11

Answer 1

Ok, we need to dolve by subtitucion;

- 3x – 10 = y

-x - 8y = 11

So, we are going to replace y in the second equation:

-x-8(-3x-10)=11

-x+24x+80=11

23x+80=11

23x=-69

x=-69/23

x=-3

Replacing x in the first equation:

-3(-3)-10=y

9-10=y

y=-1

So, finally we get (-3,-1)