# Algebra

posted by .

How do you solve and graph these equations?

y = 4x + 5
x - 2y = 4

• Algebra -

y = 4 x + 5, through (0,5) slope 4

2y = x - 4
y = (1/2) x - 2 , through(0,-2) slope (1/2)

now subtract second from first to get rid of y
0 = 3.5 x +7
x = -2
then y = -8+5 = -3
so they cross at (-2,-3)
check
y = 4x + 5
-3=4(-2)+5??
-3=-8+5 yes
x - 2y = 4
-2 -2(-3) =4 ??
-2 +6 = 4 sure enough

## Similar Questions

1. ### MATH

Please help me!!!!!!!!!!!!!!!1 Instructions a. If needed, rewrite the following equations in slope-intercept form. * b. Indicate the slope and the y-intercept for each of the equations. c. Using graph paper and a straight edge, graph …
2. ### grasping algebra concepts

My book is showing the solution for graphing a system of linear equations y > 2x - 7 y is greater than or equal to -3x + 7 I see the way they graphed it and both lines intersect at one point. Did the just find -7 and +7 on the line …
3. ### College Algebra

solve systems of equations by graphing... I get how to graph and solve equations but i just don't understand why its coming out wrong u=v 4u=3v-3
4. ### Algebra 2

how do i do these problems???? Graph each pair of equations in the same coordinate plane. Find the coordinates of the point where the graphs intersect. Then show by substitution that the coordinate satisfy both equations. 1. 2x + 5=0
5. ### Precalculus

Let G be the graph of the parametric equations x=cos(4t)and y=sin(6t). What is the length of the smallest interval I such that the graph of these equations for all t in I produces the entire graph G?
6. ### Precalculus

Let G be the graph of the parametric equations x=cos(4t)and y=sin(6t). What is the length of the smallest interval I such that the graph of these equations for all t in I produces the entire graph G?
7. ### algebra

16. Solve y = log3243. A. y = 0 C. y = 5 B. y = 3 D. y = 243 3. Which of the equations below describes the graph shown here?
8. ### algebra

Solve the system of linear equations by graphing 3x+y=0 2x-y=5 Graph the system What is the solution of the system of equations?
9. ### Math: Parametric Equations

Let G be the graph of the parametric equations x = cos(4t), y = sin(6t). What is the length of the smallest interval P such that the graph of these equations for all t E P produces the entire graph G?
10. ### Math

Let G be the graph of the parametric equations x = cos(4t), y = sin(6t). What is the length of the smallest interval P such that the graph of these equations for all t E P produces the entire graph G?

More Similar Questions