Simultaneous Equations: One Linear, One Quadratic (Grade 11)

∑ DANEMATHICS

FREE CAPS MATHS RESOURCES

Grade 11 · Equations & Inequalities

EXAM-STYLE CLASS TEST

Marks

Duration

50 minutes

Questions

Name:

Class:

Date:

Mark

/ 32

Instructions and Information

Answer ALL the questions in this question paper.
Answer QUESTION 1 by circling the letter (A–D) in the answer grid at the end of that section.
Show ALL calculations clearly.
Show all units where applicable.
Number the answers correctly according to the numbering system used in this question paper.
A non-programmable calculator may be used, unless stated otherwise.
Write neatly and legibly.

Question 1

[10 MARKS]

Four options are given as possible answers to the following questions. Choose the correct answer and circle the letter (A–D) in the grid at the end of this section. If you want to change your choice, put a cross through the wrong letter and circle your new choice.

1.1
Solve simultaneously: y = x + 1 and y = x² − 1
(1)
A)(2 ; 3) and (−1 ; 0)
B)(2 ; 3) only
C)(−1 ; 0) only
D)(2 ; 3) and (1 ; 2)
1.2
For one LINEAR and one QUADRATIC equation, the standard method is to …
(1)
A)make a variable the subject of the LINEAR equation, then substitute
B)make a variable the subject of the QUADRATIC equation, then substitute
C)add the two equations
D)subtract the two equations
1.3
Solve simultaneously: y = 2x and x² + y² = 20
(1)
A)(2 ; 4) and (−2 ; −4)
B)(2 ; 4) only
C)(2 ; 4) and (−2 ; 4)
D)(4 ; 2) and (−4 ; −2)
1.4
How many solutions can a straight line and a parabola have?
(1)
A)0, 1 or 2
B)always 2
C)always 1
D)0 or 1 only
1.5
Solve simultaneously: x + y = 5 and xy = 6
(1)
A)(2 ; 3) and (3 ; 2)
B)(2 ; 3) only
C)(1 ; 6) and (6 ; 1)
D)(−2 ; −3) and (−3 ; −2)
1.6
If substituting produces a quadratic with a NEGATIVE discriminant, then …
(1)
A)the line and the curve do not meet
B)the line is a tangent
C)there are two points of intersection
D)there are infinitely many solutions
1.7
If substituting produces a quadratic with Δ = 0, the line is …
(1)
A)a tangent to the curve
B)a secant cutting it twice
C)parallel to the curve
D)missing the curve entirely
1.8
Solve simultaneously: y = x − 1 and x² + y² = 25
(1)
A)(4 ; 3) and (−3 ; −4)
B)(4 ; 3) only
C)(3 ; 4) and (−4 ; −3)
D)(4 ; 3) and (3 ; 4)
1.9
Two numbers have a product of 24 and a sum of 11. The numbers are …
(1)
A)3 and 8
B)4 and 6
C)2 and 12
D)1 and 24
1.10
A rectangle has perimeter 26 cm and area 40 cm². Its dimensions are …
(1)
A)5 cm by 8 cm
B)4 cm by 10 cm
C)2 cm by 20 cm
D)6 cm by 7 cm

Answer grid — circle your answers for Question 1

1.1	A	B	C	D
1.2	A	B	C	D
1.3	A	B	C	D
1.4	A	B	C	D
1.5	A	B	C	D
1.6	A	B	C	D
1.7	A	B	C	D
1.8	A	B	C	D
1.9	A	B	C	D
1.10	A	B	C	D

Question 2

[10 MARKS]

Solve the following simultaneously. Show ALL your working.

2.1
y = x + 1 and y = x² − 3x + 4
(5)
2.2
x + y = 5 and x² + y² = 17
(5)

Question 3

[12 MARKS]

Answer the questions below.

3.1
Solve simultaneously: y − x = 2 and xy = 8
(5)
3.2
Explain which of the two equations should always be rearranged first, and why.
(2)
3.3
The line y = x + c cuts the parabola y = x² at two points. Determine the values of c for which this happens.
(5)

TOTAL: 32 marks

This question paper consists of 3 questions.