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Q: What is 3x plus 7y if x equals 6 y equals 4?

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T = 3x + 7y; x = 4; y = 6T = 3x + 7y (substitute 4 for x, and 6 for y)T = 3(4) + 7(6) = 12 + 42 = 54

x+7y=16 ---------------------------1 3x- 7y=4 ---------------------------2 ------------------------------------------------------------------------------------------------------------------ 1+2 x+7y=16 3x-7y=4 4x=20 x=5 substitute x = 5 in x+7y=16 (5)+7y=16 7y=11 y=11/7

y = -1 and x = -3

The ordered pair is (5, 4).

If you mean: x+7y = 39 and 3x-2y = 2 Then by substitution: x = 4 and y = 5

x = 5 and y = 4

12y - 4 = 7y + 165y = 20y = 4

4(1-4x+7y)

(2, -1)

Their graphs are.

7y+ 8x + 4= 20 + 8x- 8x - 8x7y + 4 = 20- 4 - 47y=16/7 /7y= 2.28the /7 means divide by 7 :)

10y = 9y + 4, so y = 4

If: 3x-7y+4 = 0 then 3x-7y = -4 The intercepts are at: x is at (-4/3, 0) and y is at (0, 4/7) Distance of x from the origin: 4/3 Distance of y from the origin: 4/7 Area of the triangle: 1/2*4/3*4/7 = 8/21 square units

x=4 y=5 9x+7y=?? Replace: 9(4)+7(5)= 71

(-4, -1)

-3x-8y=4

-3x+14 = -4 -3x = -4-14 -3x = -18 x = 6

-3x+2 = -4 -3x = -4-2 -3x = -6 x = 2

3x+56 = 2x+4 3x-2x = 4-56 x = -52

5y+8=7y 2y=8 y=4

x=6

4(1 - 4x + 7y)

1

3x+8 = 12 3x = 4 x = 4/3