Worksheet on linear quadratic systems is much useful to the students who would like to practice problems on the system of equations where  one equation is linear and the other one is quadratic.

## Linear quadratic systems worksheet - Problems

1)  Solve y = 2x² and y = - x + 6 graphically.

2)  Solve y = x² + 3x +2 and y =  x - 2 graphically.

3)  Draw the graph of y = 2x² and hence solve 2x²+x-6 = 0

4)  Draw the graph of y = x²+ 3x + 2 and hence solve x² + 2x + 4 = 0

## Linear quadratic systems worksheet - Solution

Problem 1 :

Solve y = 2x² and y = - x + 6 graphically.

Solution :

First let us make a table of values to graph y = 2x²

We can get the following points from the table.

(–3, 18), (–2, 8),(–1,2), (0, 0), (1, 2), (2, 8), (3, 18) ----- (1)

Now,  let us make a table of values to graph y = -x + 6

We can get the following points from the table.

(–1, 7), (0, 6), (1, 5), (1, 5), (2, 4) ----- (2)

Plotting the points which we have in (1) and (2), we get the graph of y = 2x² and y = -x + 6

From the graph, the points of intersection or the two solutions for the given system are

(-2, 8) and (1.5, 4.5)

Problem 2 :

Solve y = x² + 3x +2 and y =  x - 2 graphically.

Solution :

First let us make a table of values to graph y = x² + 3x +2

We can get the following points from the table.

(–4, 6), (–3, 2), (–2, 0), (–1, 0), (0, 2), (1, 6), (2, 12) and            (3, 20) ----- (1)

Now,  let us make a table of values to graph y = x - 2

We can get the following points from the table.

(-2, -4), (0, -2), (1, -1), (2, 0) ----- (2)

Plotting the points which we have in (1) and (2), we get the graph of y = x² + 3x +2 and y = x - 2

In the above graph, the straight line y = x - 2 does not intersect y = x² + 3x +2.

Hence, there is no solution for the given system

Problem 3 :

Draw the graph of y = 2x² and hence solve 2x²+x-6 = 0.

Solution :

First let us make a table of values to graph y = 2x²

We can get the following points from the table.

(–3, 18), (–2, 8),(–1,2), (0, 0), (1, 2), (2, 8), (3, 18) ----- (1)

Now, let us take the quadratic equation 2x²+x-6 = 0.

Form the first equation, we know y = 2x².

So, plugging 2x² = y in (2x²+x-6 = 0), we get

y + x - 6 = 0

y  =  -x + 6

Now,  let us make a table of values to graph y = -x + 6

We can get the following points from the table.

(–1, 7), (0, 6), (1, 5), (1, 5), (2, 4) ----- (2)

Thus, the roots of 2x² + x - 6 = 0 are nothing but the x - coordinates of point of intersection of y = 2x² and y  = -x  + 6.

Plotting the points which we have in (1) and (2), we get the graph of y = 2x² and y = -x + 6

Problem 4 :

Draw the graph of y = x² + 3x + 2 and use it to solve the equation x² + 2x + 4 = 0.

Solution :

First let us make a table of values to graph y = x² + 3x + 2

We can get the following points from the table.

(–4, 6), (–3, 2), (–2, 0), (–1, 0), (0, 2), (1, 6), (2, 12) and            (3, 20) ----- (1)

Now, let us take the quadratic equation x²+ 2x + 4 = 0

x²+ 2x + 4 = 0

x²+ (3x-x) + (2+2) = 0

x²+ 3x + 2 - x + 2 = 0

Form the first equation, we know y = x² + 3x + 2.

So, plugging x² + 3x + 2 = y in (x²+ 3x + 2 - x + 2 = 0), we get

y - x + 2 = 0

y  =  x - 2

Now,  let us make a table of values to graph y = x - 2

We can get the following points from the table.

(-2, -4), (0, -2), (1, -1), (2, 0) ----- (2)

Thus, the roots of x² + 2x + 4 = 0 are obtained from the points of intersection of y = x - 2 and y  = x² + 3x + 2

Plotting the points which we have in (1) and (2), we get the graph of y = x² + 3x +2 and y = x - 2

In the above graph, the straight line y = x - 2 does not intersect y = x² + 3x +2.

Hence, the quadratic equation x² + x + 4 = 0 has no real roots.

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