3 years ago

Solve by Substitution

Mathematics

2 answers:

anastassius [24]3 years ago

7 0

Answer:

$-9x-10y=12 \ -----(1)\\\\-3x+3=y \ ------(2)\\\\substitute \ y \ in \ (1)\\\\-9x -10(-3x+3) =12\\\\-9x+30x-30=12\\\\21x= 12+30\\21x=42\\x=2\\\\\\substitute \ x \ in \ (2)\\-3\cdot 2+3=y\\-6+3=y\\y=-3$

x= 2, y = -3

Pavlova-9 [17]3 years ago

5 0

X= 2 and y= -3
Just substitute the value of y into the first equation add like terms and solve

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