Find the value of y when x equals -7. -3x+6y=-21

1 answer:

7 0

You would substitute -7 wherever you see the x symbol

-3 x -7 +6y=-21
21+6y=-21

then you would move the 21 to the other side and when you move it the sign would change from a +21 to a -21.
so you would be left with
6y=-21-21
6y=-42

then you would take the 6 over and because it is being multiplied to the y on one side, it would divide on the other.

y=-42/6
y=-7

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Set of constraints to model the problem are,

$12x+9y\geq 510$

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Solution-

x = the number of lawns weeded by Gwen,

y = the number of dogs walked by Fabio.

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The equation for this is,

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y must be less than or equal to 2x.

The equation for this is,

$y \leq 2x$

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The equation for this is,

$y \geq 25$

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