Question

(9)

Use the following system of equations.
{9x + 5y = 35
{-2x - 5y = 0
What do you get when you add the 2 equations together?

(10)

Using question 9, what does x equal?

(11)

Using the equation

{9x + 5y = 35
{-2x - 5y = 0

Use your answer or (9) to find what y equals.
What does y equal?

Answer 1

Explanation:

(9)

9x + 5y = 35

-2x - 5y = 0

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7x 0 = 35

(10)

7x = 35

x = 5

(11)

we pick one of the 2 equations, e.g.

-2x - 5y = 0

-2×5 - 5y = 0

-10 - 5y = 0

-10 = 5y

y = -10/5 = -2