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How do I solve simultaneous equations using the substitution method?

2y + x = 8 (equation 1) and 1 + y = 2x (equation 2)Step 1: make y subject of equation 2: y = 2x - 1 Step 2: sub this value of y into equation 1: 2(2x - 1) + x = 8 Step 3: solve the above ...

Answered by Lulu H. • Maths tutor

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Find the roots of the following equation 2x^2-11x+14=0

First start by copying down the question and making sure that you have copied all of the correct numbers. We then identify that it is a quadratic equation due to there being an x raised to a power 2 term....

Answered by Jack D. • Maths tutor

2806 Views

(3x+9) (7x+5)

21x^2 + 78x + 45

Answered by Caitlin A. • Maths tutor

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Frank buys a car at the start of 2015, for £12,000. Each year the value fo the car depreciates by 9%. What was the value of the car at the end of 2019?

The value of the car in 2019 would be £7488.39This is because you take the original value of the car, and multiply it by the multiplier (1.00-0.09)to the power of how many years have passed since the init...

Answered by Amy N. • Maths tutor

2276 Views

Jules buys a washing machine. 20% VAT is added to the price of the washing machine. Jules then has to pay a total of £600 What is the price of the washing machine with no VAT added?

Remember that we have two values here, the price of the washing machine BEFORE and the price AFTER the 20% VAT increase. The value AFTER the increase is 600. To get to the value before, you can't simply s...

Answered by Ahmed I. • Maths tutor

9573 Views