2x-3y=9

x=-3

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

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

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

Do you need me to graph them?

yes

ok, hold on

Here it is

second graph.png

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

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

y=-16

Ok, hold on

here's the graph

third graph.png

The solution is (16,-16)

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