4 years ago

9x-2y=19 7x=21 can you please help me answer this question

1 answer:

3 0

We have such system of eq
$\left \{ {{9x-2y=19} \atop {7x=21}} \right.$
First lets solve second eq
7x=21 /:7 divide both sides by 7
x=3
Now we can substitute it to first equation
9x-2y=19
9*3-2y=19
27-2y=19 /-27 subtract 27 both sides
-2y=-8 /:(-2) divide both sides by -2
y=4 - its the answer

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