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It is a linear equation in two variables. It can be simplified but cannot be solved since two variables require two [independent] linear equations.

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It represents an equation of a straight line in two dimensional space. It is equivalent to x + y = 21.

Q: What is 3x plus 3y equals 63?

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9x-3y=63 7x-3y=45 -3y=63-9x -y=21-3x y=-21+3x 7x-3(-21+3x)=45 7x+63+9x=45 7x+9x=45-63 16x=-18 x=-1.125 y=-21+3(-1.125) y=-24.375 (-1.125,-24.375)

We have 3x+9y=36, or equivalently 12x+36y=144. We also have 12x+4y=18, so subtracting these we have 32y=126 or y=63/16. Substituting this into our original equation leaves 3x=36-9*63/16 or x = 12-3*63/16 = 3/16. So: x=3/16, y=63/16

7+ what =63

(3x - 7)(2x + 9) = 0 x = 7/3 or -9/2

63 +99 ___ 162

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9x-3y=63 7x-3y=45 -3y=63-9x -y=21-3x y=-21+3x 7x-3(-21+3x)=45 7x+63+9x=45 7x+9x=45-63 16x=-18 x=-1.125 y=-21+3(-1.125) y=-24.375 (-1.125,-24.375)

y=3x+7 7x +3y=63

We have 3x+9y=36, or equivalently 12x+36y=144. We also have 12x+4y=18, so subtracting these we have 32y=126 or y=63/16. Substituting this into our original equation leaves 3x=36-9*63/16 or x = 12-3*63/16 = 3/16. So: x=3/16, y=63/16

7+ what =63

(3x - 7)(2x + 9) = 0 x = 7/3 or -9/2

lets call the one number X and the other Y so y equals 3X so 3X plus X equals 84 so 4X equals 84 we divide by 4 so x equals 21 so y equals 21 times 3 equals 63 so the two numbers are 63 and 21

63 +99 ___ 162

63+59+75 = 197

The answer is the number for 'y' that makes the equation a true statement.Here's how to find it:63 - y = 2y + 3Add 'y' to each side:63 = 3y + 3Subtract 3 from each side:60 = 3yDivide each side by 3:20 = y

'63'

3 / 9x+63 / 3(3x+2)1 / 3x+2

63 plus 47 plus 42 plus 21 is equal to 173.