TheBlaccYoshi TheBlaccYoshi
  • 25-11-2020
  • Mathematics
contestada

Solve using ELIMINATION (with step by step explanation) Please

3x+y=-9
y=5x+7

Respuesta :

evanc7515
evanc7515 evanc7515
  • 25-11-2020

Answer:

x = -2 (verified by algebra) ✅

Step-by-step explanation:

Since we are given the value of y, we can replace it with 5x + 7.

We now have: 3x + 5x + 7 = -9

We can now simplify by adding 3x and 5x to get 8x.

8x + 7 = -9

We can subtract 7

8x = -16

And now, we divide by 8

x = -2

We can check to make sure we are correct

3(-2) + 5 (-2) + 7 = -9

-6 + -10 + 7 = -9

-9 = -9 ✅

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