3 years ago

Please help me please

Mathematics

1 answer:

Nataliya [291]3 years ago

7 0

Answer:

Step-by-step explanation:

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This is a solving system of equations with the elimanaton method pls help

a_sh-v [17]

Answer:

Step-by-step explanation:

$\underline{+\left\{\begin{array}{ccc}-4x+9y=9\\3x-9y=-18\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad-x=-9\qquad\text{chnge the signs}\\.\qquad\boxed{x=9}\\\\\text{Put the value of x to the first equation.}\\\\-4(9)+9y=9\\-36+9y=9\qquad\text{add 36 to both sides}\\9y=45\qquad\text{divide both sides by 9}\\\boxed{y=5}$