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prisoha [69]
2 years ago
12

HELP FASTTTT Which graph shows the solution to the system of linear inequalities ?

Mathematics
2 answers:
Anastasy [175]2 years ago
6 0
First, look at the equation
y < x + 1
We can find the line
y = x + 1
on a graph (drawing attached). It forms a diagonal line. Since y is less than, not equal, to x + 1, we shade the graph below that line.

Only one graph shows this correctly.

To find the graph for the equation
x - 4y \leqslant 4
we first have to simplify the equation:
x - 4y \leqslant 4 \\  - 4y \leqslant 4 - x \\ y \geqslant  - 1 +  \frac{1}{4} x \\ y \geqslant  \frac{1}{4} x - 1
First, we subtract x from both sides.
Then we divide -4 from both sides, switching the direction of the inequality because we divided by a negative number.
We can now use this equation to find a graph.

The greater than or equal to sign means that we shade upward from the line (drawing attached).
y =  \frac{1}{4} x - 1


As for which graph, it is graph #1, since the line for
y < x + 1
is a dotted line, not a solid line, because the < sign prevent the equation from fully reaching the line.

Mice21 [21]2 years ago
4 0
Well, we do not see the lines clearly (if they are dotted (inequality) or solid (inequality or equal) ), but we'll come back to this.

y<x+1  can be simplified to be y<x if we ignore the constants, so the valid part is BELOW the line, since (y<)

x-4y <=4
again, ignore the constants and simplify to 
x-y<0 or
y>x   so the valid part is ABOVE the line (since y>)

There are two graphs that satisfy BOTH conditions, pink (slope=1) at the bottom, and blue (slope = 1/4) on top, i.e. first and third graph.

For the absolute inequality (y<x+1), the red line must be dotted.
For the <= condition, the blue line must be solid.

As we cannot see the lines clearly, you will make the choice between the first and third graphs according to the previous paragraph.

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