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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
5088 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...
MN
Answered by Madison N. • Maths tutor
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Rearranging formulae

Sometimes in maths you will encounter equations with an unknown value, such as X+3=7. Though this is a very simple example that you can probably do in your head without thinkig much, knowing the principles o...
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Answered by Natalia S. • Maths tutor
2983 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
MK
Answered by Martha K. • Maths tutor
3614 Views

Solve these two equations simultaneously: 7x+y=1 and 2x^2 - y=3

Number Equations7x+y=12x^2 - y=3Rearrange equation 1 to equal yy=1-7xSubstitute 1 into 22x 2 - (1-7x)=32x 2 +7x-1=3Format into quadratic equation2x 2 +7x-4=0 (2x-1)(x+4)=02x-1=0 x+4=02x=1 x=1/2 x=-4Then work...
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Answered by Thalia S. • Maths tutor
2145 Views