Write the equation, use “X” to represent the unknown number. Solve for the unknown 20. The difference between a number and 16 is the square of (-5)

21. When three times A number is increased by five, The result is 10.

22. When is 3 sevenths of a number is decreased by two, The result is eight

Step-by-step explanation:

20)

x - 16 = (-5)²

x - 16 = 25

x = 25 + 16

x = 41

21)

3x + 5 = 10

3x = 10 - 5

3x = 5

x = 5/3

22)

3/7 of x - 2 = 8

3x - 14/7 = 8

3x - 14 = 8 × 7

3x - 14 = 56

3x = 56 + 14

3x = 70

x = 70/3

x=-2

infinite number of lines, so there is an infinite number of equations.

step-by-step explanation:

there are an infinite number of line that passes through the point (-2,5)

x=-2   is one line that passes through the point

y = 5 is another line that passes through the point

(these two lines are perpendicular to each other).

since the number of   numbers are infinite and the slope is the ratio of two numbers,(change in y over change in x) we can have an infinite number of slopes.     our only condition is that it passes through the point (-2,5)