Solving systems of equations algebraically.
y = -5
5x + 4y= -20
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Step-by-step explanation:

If y = - 5

Then put value of y

5x + 4(-5) = - 20

5x - 20 = - 20

5x = - 20 + 20

5x = 0

x = 0

x = 0

y = -5

Step-by-step explanation:

Since you already have the value of y, all you need to do is plug it into the equation, like so:

5x + 4y = -20

5x + 4(-5) = -20

5x - 20 = -20

Add 20 to both sides:

5x - 20 = -20

    + 20  + 20

5x = 0

Finally, divide both sides by 5:

5x = 0

x = 0

So now you have, x = 0 and y = -5

1. supplementary angles

2. acd and bcd

step-by-step explanation: