SOLUTION: Help - I'm a mom trying to help my son with his pre-algebra. The Prentice Hall book says to Graph the equation. 4x + y = -3 We've been able to solve for x by x + y = -3/4 the

Algebra ->  Graphs -> SOLUTION: Help - I'm a mom trying to help my son with his pre-algebra. The Prentice Hall book says to Graph the equation. 4x + y = -3 We've been able to solve for x by x + y = -3/4 the      Log On


   

Question 20360: Help - I'm a mom trying to help my son with his pre-algebra.
The Prentice Hall book says to Graph the equation.
4x + y = -3
We've been able to solve for x
by x + y = -3/4
then x = -3/4 - y
This matches up with the answer in the back of the book - it shows the graph -
but can't figure out how to solve for y.
Any help would be gratefully appreciated.
Answer by ichudov(507) About Me  (Show Source):
You can put this solution on YOUR website!
Solved by pluggable solver: DESCRIBE a linear EQUATION: slope, intercepts, etc
Equation 4+x+%2B+1+y+=+-3 describes a sloping line. For any
equation ax+by+c = 0, slope is -a%2Fb+=+-4%2F1.
  • X intercept is found by setting y to 0: ax+by=c becomes ax=c. that means that x = c/a. -3/4 = -0.75.
  • Y intercept is found by setting x to 0: the equation becomes by=c, and therefore y = c/b. Y intercept is -3/1 = -3.
  • Slope is -4/1 = -4.
  • Equation in slope-intercept form: y=-4*x+-3.
graph%28+500%2C+500%2C+-0.75-8%2C+-0.75%2B8%2C+-3-8%2C+-3%2B8%2C+-4%2Ax%2B-3+%29+