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how do u do mx+b??? for math

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2 Answers

First method:
If you have x and the corresponding y values, then you can plot the straight line on a graph paper. Y axis being the vertical axis and X axis being the horizontal axis. Once your x and y values are plotted, draw the best fit line that passes through most of the points. Extend the straight line till it cuts the y-axis and the y-intercept is the b value.

Second method:
Is by calculations. If you have 2 sets of x and y values, do simultaneous equations and you can get both 'm' and 'b' values.

y = mx + b is a form of a line, where m is the slope of the line, and b is the y-intercept. 

an example would be: y = 2x + 1

2 is the slope which means the line increases along the y axis 2 units for every 1 unit along the x axis.

1 is the y-intercept which means the line crosses the y axis at 1 and the point (0,1) is guaranteed to be on this line.