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Substitute in y to the first equationx² + (3x+1)² = 510x² + 6x - 4 = 55x²+3x-2=0(5x-2)(x+1)x=2/5 or -1Sub these values of x into the first equationy=11/5 and -2...

To find more complicated percentages, we need to first be able to convert percentages into fractions. To do this, we take 100 as the denominator and the percentage as the numerator, so 28% = 28/100. Now w...

First collect the like terms on one side.(-3y) 2y+18=4Then solve as a normal equation.(-18) 2y=-14(÷2) y=-7

The area of a square is the length of one side squared (multiplied by itself), so for a square with side length 3, the area will be 3² or 3 x 3, which = 9. For a square with side length x, the ...

There are two easy ways to solve simultaneous equations. Substitution and elimination. In order to work with substitution we must rearrange one equation to be equal to either x or y. In this case, 2x+4y=8...