# System of equations - 9th grade (14y) - math problems

#### Number of problems found: 531

• Equations Solve following system of equations: 6(x+7)+4(y-5)=12 2(x+y)-3(-2x+4y)=-44
• Three unknowns Solve the system of linear equations with three unknowns: A + B + C = 14 B - A - C = 4 2A - B + C = 0
• Equations - simple Solve system of linear equations: x-2y=6 3x+2y=4
• Two equations Solve equations (use adding and subtracting of linear equations): -4x+11y=5 6x-11y=-5
• Substitution solve equations by substitution: x+y= 11 y=5x-25
• Linear system Solve a set of two equations of two unknowns: 1.5x+1.2y=0.6 0.8x-0.2y=2
• A candle A candle shop sells scented candles for \$16 each and unscented candles for \$10 each. The shop sells 28 candles today and makes \$400. a. Write a system of linear equations that represents the situation. b. Solve the system to answer the questions: How many
• Elimination method Solve system of linear equations by elimination method: 5/2x + 3/5y= 4/15 1/2x + 2/5y= 2/15
• Sweets 3 chocolate and 7 cakes cost 85, - CZK. 2 chocolates and 6 cakes cost 86, - CZK. How much is 5 chocolates and 9 cakes? I wonder how to get the result, but only by logic without the use of a system of equations
• Algebrogram Solve algebrogram: mama+anna=vari How many solutions are?
• Sequence In the arithmetic sequence is given: Sn=2304, d=2, an=95 Calculate a1 and n.
• Algebrogram Solve algebrogram for sum of three numbers: BEK KEMR SOMR ________ HERCI
• Two numbers 7 The sum of two consecutive even numbers is 30. Find the numbers.
• ATC camp The owner of the campsite offers 79 places in 22 cabins. How many of them are triple and quadruple?
• Function For linear function f(x) = ax + ​​b ‬ is f(14)=179; f(15)=154. Calculate m, if f(m) = 2019 .
• Together m+w Women 30%. Men are 360 more. How many are together?
• AP 6 Calculate the first five items of an arithmetic sequence if it is given: a2 – a3 + a5 = 20 a1 + a6 = 38
• Three ints The sum of three consecutive integers is 2016. What numbers are they?
• Value 4 If 5/18=425, what is the value 13/18?
• Arithmetic progression In some AP applies: 5a2 + 7a5 = 90 s3 = 12 Find the first member a =? and difference d = ?

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