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first you sub in the values you know so3(2) + 4(-1) + 7z =12then you simply the equation6-4+7z=122+7z=12then you put all the letter values on one side and all the numbers on the other12-2= 7zthen simplify...

first you let the given number equal xeg x = 0.8989898989. equation 1then look at the decimal and figure out which number is repeating. here it is 89 a two digit numberso we multiply x and the decimal by ...

As they both equal y these 2 terms can be equated to each other.x+1 = x^2+1We can re-arrange this new equation, and solve for x.This equals: 0 = x^2 - xsolve for x:0 = x(x-1)so x = 1, 0.

7x + 8y = 32 (let this be equation [1])x - 4y = 8 (let this be equation [2])
Make x the subject in equation [2] => x = 8 +4y (let this be equation [3])Sub [3] into [1]
7x + 8y = 32 => 7(8 ...

(9 x 3) + (18 / 3)
BIDMASBracketsIndicesDivideMultiplyAddSubtract
Br...