Question

Use addition to solve the linear system of equations.
y = 2x - 5
3x + 3 = 7

(2, -1)
(2, 1)
(-8, -21)
(-1.6, -8.2)

Answer 1

Answer:

(-8, -21)

Step-by-step explanation:

Given the two equations ...

• y = 2x -5
• 3x +3 = y

you can solve them by adding the first equation to the second.

... (y) + (3x+3) = (2x-5) +(y)

... y + 3x + 3 = 2x -5 +y

Adding -y -2x -3 to both sides of the equation gives ...

... x = -8

Putting this value in the first equation gives ...

... y = 2(-8) -5 = -21