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melomori [17]
4 years ago
9

HELLPPP Solve the system by substitution. -9x-10y=12 −3x+3=y

Mathematics
2 answers:
Ksju [112]4 years ago
3 0
HELLPPP

Solve the system by substitution.
-9x-10y=12
−3x+3=y


X=2
Y= -3
Lelechka [254]4 years ago
3 0

Answer:

x=2\\y=-3

Step-by-step explanation:

We have:

-9x-10y=12\\-3x+3=y

Since we already have a variable value (y) in the second equation, it would be easiest to substitute the value for y in the first equation:

-9x-10(-3x+3)=12

Distribute -10 into (-3x+3):

-9x+30x-30=12

Combine like terms:

21x-30=12

Add 30 to both sides of the equation:

21x=42

Divide by the coefficient of x, which is 21:

x=2

_

Now that we have our x value, we can substitute that in to the second equation to find our y value:

-3(2)+3=y

Multiply:

-6+3=y

Combine like terms:

-3=y

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