If y = 5x, then y is proportional to X______ (judge right or wrong)

Because y = 5x, so y △ x = 5 (certain), then y and X are in direct proportion

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1. 1. When the polynomial x ^ 2 + 6x + y ^ 2-8y + 30 has a minimum value, x =? Y =? 2. If x ^ 2 + 2x-1 = 0, then 5x ^ 2 + 10x-3 =?
2. If 4 / x = 8 / y, X is proportional to y, if 4x = 8y (x, y are not 0), X is proportional to y
3. Find the plane equation passing through X axis and perpendicular to 5x + y-2z + 3 = 0?
4. Find the plane equation that passes through the Y axis and is perpendicular to the plane 5x + 3y-2z + 3 = 0
5. The linear equation passing through point (1, - 1, - 2) and perpendicular to plane 2x-2y + 3Z = 0
6. The plane equation of the line x + y + Z-1 = 0,2x-y + 3Z = 0 and parallel to the line x = 2Y = 3Z is solved
7. The linear equation passing through point (1, - 1, - 2) and perpendicular to plane 2x-2y + 3Z = 0
8. Find the plane equation which passes through point (1, - 1,1) and is perpendicular to two planes X-Y + Z = 1, 2x + y + Z + 1 = 0?
9. It is known that 4x-3y-3z = x-3y + Z = 0 (x, y, Z are not equal to 0) (1) Find X: Y: Z (2) find the value of 2x + 3y-4z / Z
10. The equation of the line passing through the point M0 (2, - 1,0) and perpendicular to the plane: x-2y + 3Z = 0 is
11. : if y = 5x, then x and y are () proportional; if x = Y / 5, then x and y are () proportional
12. Why is 5x = 8y (x ≠ 0), then y and X are proportional? I don't know how it's proportional,
13. Given that 5x + 8y = 0 and X ≠ 0, find the ratio of X and y
14. Because 5x = 8y, so x: y = 8:5 () right or wrong?
15. X square + 4ax + y square - 8y + 20 = 0 find the value of X + y
16. Given that the square of x minus 6xy plus the square of 8y equals 0, the value of the Y branch X of the ball
17. Solve the plane equation which passes through point (1,2,1) and is perpendicular to two planes x + y = 0 and 5Y + Z = 0?
18. Find the linear equation which is parallel to the intersection of two planes x-4z = 3 and 2x-y-5z = 1 and passes through the point (- 3,2,5) Do you want to ask whether the lower intersection line can be obtained by subtracting the two plane equations directly? That is, the intersection line equation is X-Y-Z = - 2?
19. To solve a high number problem: to find the plane equation which passes through the intersection of two planes x-4z = 3 and 2x-y-5z = 1 and is perpendicular to the plane 2x-5y + 5Z = 3 Find the plane equation through the intersection of two planes x-4z = 3 and 2x-y-5z = 1 and perpendicular to the plane 2x-5y + 5Z = 3 2. Change vertical solution to parallel solution I still don't understand
20. Help! Use the knowledge of higher numbers to solve (2) find the straight line L: {█（ 4x-y+z-1=0@x+5y-z+2=0 ）Plane equations parallel to the x-axis