The value of b=-7.
y=3x+b
point(2,-1)
x=2, y=-1
subtract into equation
-1 = 3(2) +b
-1 = 6+b
-1-6 = b
b= -7
What are the coordinates of a point?
Coordinates are a couple of numbers that describe the precise function of a factor on a cartesian aircraft through the use of the horizontal and vertical lines known as the coordinates. commonly represented by (x, y) the x cost and y price of the point on a graph. Each factor or an ordered pair consists of two coordinates.
A factor-to-factor graph also referred to as a line graph, is a pictorial rendition of records wherein specific values of a feature are plotted as dots on a coordinate aircraft.
Learn more about graphs through the point here: https://brainly.com/question/14323743
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