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Can you solve this system of inequalities?

Graph this system of linear inequalities. Shade in the correct areas.

2x + 5y > 5
6x - 5y < -15

Click through the slideshow to reveal the answer steps.


First rearrange both equations into slope-intercept form:

2x + 5y > 5
5y > -2x + 5
y > \(\small\mathsf{ \frac{-2x}{5} }\) + 1

6x - 5y < -15
5y > 6x + 15
y > \(\small\mathsf{ \frac{6x}{5} }\) + 3

Draw the lines. Both lines will be dotted, and we will shade above both lines, since both equations are just " greater than" (>), not greater than or equal to ≥.

Now shade in the area above equation 1 because it is greater than 5. Here is the graph with just the shading for equation 1.

Now shade in the area above -15. Here is the graph with just the shading for equations 2.

Here is the graph with shading for both equations:

Now, choose a point in the overlapping shaded area to check your answer. Let's go with (1,10).

2x + 5y > 5
2(1) + 5(10) > 5
2 + 50 > 5
52 > 5
True
6x - 5y < -15
6(1) - 5(10) < -15
6 - 50 < -15
-44 < -15
True

Now, choose a point NOT in the overlapping shaded area to check your answer. Let's try (0,0) since it is not shaded at all.

2x + 5y > 5
2(0) + 5(0) > 5
0 > 5
False
6x - 5y < -15
6(0) - 5(0) < -15
0 < -15
False