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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...

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...

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...

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

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...