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Solve the simultaneous equations 5x + y = 21, and x - 3y = 9.

2 unknowns? Let's make it into a simpler equation you know how to solve with only one unknown! How? Key is to note that you can add and subtract equations. You can also multiply the equations by some constan...
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Answered by Sara H. • Maths tutor
4602 Views

Solve the following simultaneous equations: (1) 3x – 2y = 7 (2) 5x + 2y = 17

When looking at the two equations we can see that the 'y' terms in both equations are the same, but with the opposite sign. This means that by adding the two equations we can eliminate the 'y' values. Step 1...
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Answered by madeleine f. • Maths tutor
4989 Views

What is the length of x?

If angle = 50 degrees, hypotenuse = x, adjacent side = 5 cm, opposite side = 7 cm, and is a right angled triangle,Use cos(theta)=adjacent/hypotenuseSo, cos(50) = 5/xrearranging the equation to make x the sub...
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Answered by Madison N. • Maths tutor
3504 Views

Find x. x^2 + 6x + 5

2x^2 + 7x + 6Quadratic formula x = -b+-(√b^2+4ac)/2aPut in the numbers given that a=1, b=6 and c=5x = 2,3
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Answered by Martha K. • Maths tutor
3537 Views

The value of a new car is £18,000. The value of the car decreases by 25% in the first year and 12% in each of the next 4 years. Work out the value of the car after 5 years?

The initial value of the car is 18000. To subtract 25% of 18000 one must times 18000 by 0.75 which equals 13500. Next, one must times 13500 by 0.88 to the power of 4 which equals 8095.89 to 2 decimal places ...
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Answered by Lottie B. • Maths tutor
5916 Views