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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.

Answered by madeleine f. • Maths tutor

4198 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 ...

Answered by Madison N. • Maths tutor

2566 Views

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 principle...

Answered by Natalia S. • Maths tutor

1998 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

Answered by Martha K. • Maths tutor

3061 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 22x²- (1-7x)=32x²+7x-1=3Format into quadratic equation2x²+7x-4=0 (2x-...

Answered by Thalia S. • Maths tutor

1496 Views