Brianna’s teacher asks her which of these three expressions are equivalent to each other.

Expression A:
9
x
−
3
x
−
4
Expression B:
12
x
−
4
Expression C:
5
x
+
x
−
4

Brianna says that all three expressions are equivalent because the value of each one is
−
4
when
x
=
0
.

Brianna’s thinking is incorrect.

Expression A and C are correct because 9x - 3x = 6x and 5x + x = 6x, then -4

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)

5

step-by-step explanation: