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Lesson: Systems of Equations with Substitution

In this lesson, we will learn how to solve a system of equations by substituting one equation into the other.

Video

17:15

Sample Question Videos

03:33
01:58
03:03

Worksheet • 25 Questions • 5 Videos

Q1:

Find π‘₯ given 2 π‘₯ βˆ’ 𝑦 = 5 and 𝑦 = 7 π‘₯ .

  • A βˆ’ 1
  • B 5 9
  • C 5 2
  • D 9 5

Q2:

Solve the simultaneous equations 𝑦 + 4 π‘₯ = βˆ’ 8 and 𝑦 = 5 π‘₯ + 1 0 .

  • A π‘₯ = βˆ’ 2 , 𝑦 = 0
  • B π‘₯ = 8 , 𝑦 = βˆ’ 2
  • C π‘₯ = βˆ’ 2 , 𝑦 = βˆ’ 2 0
  • D π‘₯ = 0 , 𝑦 = βˆ’ 2
  • E π‘₯ = βˆ’ 2 , 𝑦 = 8

Q3:

Solve the simultaneous equations 2 π‘₯ + 𝑦 = 1 1 and π‘₯ βˆ’ 2 𝑦 = 3 .

  • A π‘₯ = 5 , 𝑦 = 1
  • B π‘₯ = 1 , 𝑦 = 5
  • C π‘₯ = 2 , 𝑦 = 5
  • D π‘₯ = 5 , 𝑦 = 2

Q4:

Solve the simultaneous equations π‘₯ βˆ’ 𝑦 = 4 and π‘₯ + 𝑦 = 1 4 .

  • A π‘₯ = 9 , 𝑦 = 5
  • B π‘₯ = 5 , 𝑦 = 9
  • C π‘₯ = 9 , 𝑦 = 2 3
  • D π‘₯ = 2 3 , 𝑦 = 9

Q5:

Shady and Maged each have a marble collection to sell. Maged has 1 more than 3 times the number of marbles Shady has. How many marbles does each boy have to sell if the total number of marbles is 113?

  • AShady: 28, Maged: 85
  • BShady: 56, Maged: 57
  • CShady: 85, Maged: 28
  • DShady: 76, Maged: 37
  • EShady: 37, Maged: 76

Q6:

Find two numbers whose sum is 28 and difference is 13.

  • A 4 1 2 , 1 5 2
  • B41, 28
  • C βˆ’ 2 0 , 8
  • D20, 8

Q7:

The difference between two numbers is 9. Twice the sum of the two numbers is 10. Find the two numbers.

  • A βˆ’ 2 , 7
  • B βˆ’ 4 , 5
  • C2, 7
  • D βˆ’ 1 , 6

Q8:

Solve the simultaneous equations π‘₯ + 4 𝑦 = 1 7 and 2 π‘₯ + 7 𝑦 = 5 .

  • A π‘₯ = βˆ’ 9 9 , 𝑦 = 2 9
  • B π‘₯ = 2 9 , 𝑦 = βˆ’ 9 9
  • C π‘₯ = βˆ’ 3 1 , 𝑦 = 1 2
  • D π‘₯ = 1 2 , 𝑦 = βˆ’ 3 1

Q9:

Find the values of π‘Ž and 𝑏 , given the arithmetic mean between π‘Ž and 𝑏 is 62 and the arithmetic mean between 2 π‘Ž and 3 𝑏 is 3 2 1 2 .

  • A π‘Ž = 5 1 , 𝑏 = 7 3
  • B π‘Ž = 1 0 2 , 𝑏 = 2 1 9
  • C π‘Ž = 5 1 2 , 𝑏 = 7 3 2
  • D π‘Ž = 1 9 7 , 𝑏 = βˆ’ 7 3
  • E π‘Ž = βˆ’ 7 3 , 𝑏 = 1 9 7

Q10:

Find the values of π‘Ž and 𝑏 , given the arithmetic mean between π‘Ž and 𝑏 is βˆ’ 3 4 and the arithmetic mean between 4 π‘Ž and 2 𝑏 is βˆ’ 7 6 .

  • A βˆ’ 8 , βˆ’ 6 0
  • B βˆ’ 7 , βˆ’ 5 9
  • C βˆ’ 6 , βˆ’ 6 2
  • D βˆ’ 9 , βˆ’ 6 1

Q11:

Find the values of π‘₯ and 𝑦 , given the arithmetic mean between π‘₯ and 𝑦 is 77.5 and the arithmetic mean between 7 π‘₯ and 6 𝑦 is 467.

  • A π‘₯ = 4 , 𝑦 = 1 5 1
  • B π‘₯ = 7 , 𝑦 = 1 4 8
  • C π‘₯ = 7 6 , 𝑦 = 6 7
  • D π‘₯ = 1 , 𝑦 = 1 5 4

Q12:

If 7 π‘₯ βˆ’ 4 𝑦 = 8 and π‘₯ = 4 , what is the value of 𝑦 ?

Q13:

Given that ( βˆ’ 2 π‘Ž , 8 ) = ( 2 𝑏 βˆ’ 2 , π‘Ž ) , find the values of π‘Ž and 𝑏 .

  • A π‘Ž = 8 , 𝑏 = βˆ’ 7
  • B π‘Ž = βˆ’ 7 , 𝑏 = 8
  • C π‘Ž = 8 , 𝑏 = 7
  • D π‘Ž = βˆ’ 8 , 𝑏 = βˆ’ 7

Q14:

If π‘₯ + 𝑦 = 7 0 and π‘₯ = 4 7 , what is the value of 𝑦 ?

Q15:

Solve the simultaneous equations by first finding an equation in π‘₯ and then 𝑦 .

  • A π‘₯ = βˆ’ 1 , 𝑦 = 3
  • B π‘₯ = 3 , 𝑦 = βˆ’ 1
  • C π‘₯ = 1 , 𝑦 = βˆ’ 1
  • D π‘₯ = βˆ’ 1 , 𝑦 = 1
  • E π‘₯ = 1 , 𝑦 = 3

Q16:

If 7 π‘₯ βˆ’ 𝑦 = 2 1 and 𝑦 = 4 π‘₯ , find π‘₯ .

Q17:

Solve the simultaneous equations by first finding an equation in terms of π‘₯ and then substituting your value of π‘₯ to find 𝑦 .

  • A π‘₯ = 1 , 𝑦 = 8
  • B π‘₯ = 3 , 𝑦 = 6
  • C π‘₯ = βˆ’ 1 , 𝑦 = βˆ’ 2
  • D π‘₯ = βˆ’ 1 , 𝑦 = 8
  • E π‘₯ = 1 , 𝑦 = 1 0

Q18:

Karim’s father’s age equals Karim’s age multiplied by 10. If difference between their ages is 18 years, how old are they?

  • A2, 20
  • B2, 22
  • C3, 23
  • D12, 30

Q19:

Two integers π‘₯ and 𝑦 have a sum of 82 and a product of 1 6 8 0 . Write an equation which could be solved to find the possible values of π‘₯ .

  • A π‘₯ ( 8 2 βˆ’ π‘₯ ) = 1 6 8 0
  • B π‘₯ = 1 6 8 0 8 2
  • C π‘₯ 1 6 8 0 = 8 2
  • D 8 2 π‘₯ = 1 6 8 0 π‘₯

Q20:

Solve the following system of equations:

  • A π‘₯ = 2 , 𝑦 = 1
  • B π‘₯ = 2 , 𝑦 = βˆ’ 1
  • C π‘₯ = βˆ’ 2 , 𝑦 = βˆ’ 1
  • D π‘₯ = 1 , 𝑦 = 2

Q21:

Solve the following system of equations:

  • A π‘₯ = 2 , 𝑦 = 2
  • B π‘₯ = βˆ’ 2 , 𝑦 = βˆ’ 2
  • C π‘₯ = βˆ’ 2 , 𝑦 = 2
  • D π‘₯ = 2 , 𝑦 = βˆ’ 2

Q22:

Two numbers have a sum of 56. If one number is one-third of the other, what are the numbers?

  • A14, 42
  • B27, 29
  • C18, 56
  • D18, 28
  • E14, 28

Q23:

A man’s age is 9 more than 2 times his son’s age. Given that the sum of their ages is 57, find each of their ages.

  • A 16 years, 41 years
  • B 22 years, 70 years
  • C 22 years, 41 years
  • D 16 years, 35 years

Q24:

A movie theater sold 1 2 0 0 tickets. If a child’s ticket costs $5.95, an adult’s ticket costs $11.15, and the total revenue was $ 1 2 7 5 6 , how many of each type of ticket did they sell?

  • A120 child tickets, 1 0 8 0 adult tickets
  • B 1 0 8 0 child tickets, 120 adult tickets
  • C 1 0 0 0 child tickets, 200 adult tickets
  • D200 child tickets, 1 0 0 0 adult tickets

Q25:

Solve the simultaneous equations 2 π‘₯ βˆ’ 𝑦 = 1 4 and 2 𝑦 βˆ’ 3 π‘₯ = 5 .

  • A π‘₯ = 3 3 , 𝑦 = 5 2
  • B π‘₯ = 4 7 , 𝑦 = 3 3
  • C π‘₯ = 5 2 , 𝑦 = 3 3
  • D π‘₯ = 8 0 , 𝑦 = 3 3
  • E π‘₯ = 3 3 , 𝑦 = 6 6
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