ANSWERS: 2
  • Put "=0" on the end so it's 5x-4y+20=0. Solve for y. Then it will be y=...
  • 1) "There are several forms that the equation of a line can take. They may look different, but they all describe the same line--a line can be described by many equations. All (linear) equations describing a particular line, however, are equivalent. The first of the forms for a linear equation is slope-intercept form. Equations in slope-intercept form look like this: y = mx + b where m is the slope of the line and b is the y-intercept of the line, or the y-coordinate of the point at which the line crosses the y-axis. To write an equation in slope-intercept form, given a graph of that equation, pick two points on the line and use them to find the slope. This is the value of m in the equation. Next, find the coordinates of the y-intercept--this should be of the form (0, b). The y- coordinate is the value of b in the equation. Finally, write the equation, substituting numerical values in for m and b. Check your equation by picking a point on the line (not the y-intercept) and plugging it in to see if it satisfies the equation." Source and further information: http://www.sparknotes.com/math/algebra1/writingequations/section1.html 2) Basically you have to go from the form: 5x-4y+20 = 0 to the form: y = mx + b Just put the y term on the other side (by changing sign) and swap sides: 4y = 5x+20 You are almost here...

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