Tell whether each of the following is an expression or not an expression. 6. 15
expression
not an expression
7. X +5=8
expression
not an expression
8. 5x - 3y +0.25
expression
not an expression

No, yes, yes

Step-by-step explanation:

An expression is a mathematical sentence that has at least two numbers and at least one mathematical operation/symbol.

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)