graph and check to solve the linear system

Algebra
Tutor: None Selected Time limit: 1 Day

2x-3y=9

x=-3

May 5th, 2015

Here's the graph

studypool graph.png

You can see that the lines intersect at (-3,-5)   That is the solution.

Let's check by plugging into the first equation

2(-3) - 3(-5) = -6 + 15 = 9  CHECK

May 5th, 2015

what about for this one ... y=-x+3 and y=x+1

May 5th, 2015

Do the same thing. Graph both lines.  Where they intersect is the solution.

May 5th, 2015

Do you need me to graph them?

May 5th, 2015

yes


May 5th, 2015

ok, hold on

May 5th, 2015

Here it is

second graph.png

The point of intersection and the solution is (1,2)

May 5th, 2015

okay last one what about 5x+4y=16

y=-16

May 5th, 2015

Ok, hold on

May 5th, 2015

here's the graph

third graph.png

The solution is (16,-16)

May 5th, 2015

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