Question

Solve the following system of equations using substitution. Upload a

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x= 20 + 6y
3x – 3y = 15

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Answer 1

x = 2, y = -3

Explanation:

Substitute x = 20 + 6y into 3x - 3y = 15:

`3 (20+6y) - 3y = 15\\60 + 18y - 3y = 15\\60 + 15y = 15\\15y = -45\\y = -3`

Substitute this back into the equation x = 20 + 6y

`x = 20 + 6 * (-3)\\x = 20 - 18\\x = 2`