127k views
13 votes
2x+y=3;x-y=0 graphical method

User Boogie
by
8.4k points

1 Answer

0 votes

Answer:

(x, y) = (1, 1)

Explanation:

A graphing calculator works nicely for solving equations graphically.

__

If you want to plot these by hand, it is convenient to write them in slope-intercept form:

y = -2x +3 . . . . . subtract 2x from both sides of the first equation

y = x . . . . . . . . . add y to both sides of the second equation

These tell you the first line goes through (0, 3) with a slope of -2. The second line goes through the origin with a slope of +1.

The solution is ...

(x, y) = (1, 1)

_____

Additional comment

Slope-intercept form is not the only convenient form for graphing the equation of a line. The first equation, for example, is given in standard form, which makes it easy to see the x-intercept is 3/2, and the y-intercept is 3. Sometimes plotting points with a fractional coordinate can be problematical, so we choose to put that equation into a different form.

The second equation quite clearly tells us y=x, so we know that line goes through points that have the same x- and y-coordinates.

2x+y=3;x-y=0 graphical method-example-1
User Twister
by
8.8k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories