Question

I need help with a question

Answer 1

y=3 x=-15 because that’s just the answer

Answer 2

y = 3

x = -15

Explanation:

When substituting, we want to get rid of one of the variables. (It's easiest ot find the variable in terms of other variable)

so, we know that...

x + 5y = 0

- 5y - 5y

x = -5y

We can plug this x-value into the second equation to find our y-value:

3y + 2x = -21

3y + 2(-5y) = -21

3y - 10y = -21

-7y = -21

÷ -7 ÷ -7

y = 3

So, if x = -5y,

x = -5y

x = -5(3)

x = -15

(we can test these values in one of the original equations):

x + 5y = 0

(-15) + 5(3)= 0

-15 + 15 = 0

{true}

so, y = 3 ; and x = -15

hope this helps!! :)