Question

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Answer 1

1) -3x = -21; x = -21 / -3; x = 7

2) -2x = $\frac{2}{9}$; x = $\frac{2}{9}$ / $(-\frac{2}{1})$; x = $\frac{2}{9}$ * $(-\frac{1}{2} )$ = -$\frac{1}{9}$

3) -1,2x = -4,2; x = -4,2 /  -1,2; x = 3,5

4) $\frac{2}{9}$x = -$\frac{4}{27}$; x = $-\frac{4}{27}$ * $\frac{9}{2}$ = $\frac{2}{3}$

5) 3(4x - 5) - 10(2x-1) = 33

12x - 15 - 20x - 10 = 33

-8x -25 = 33

-8x = 33 + 25; -8x = 58; x = 58 / -8; x = $-4\frac{3}{4}$ або x = -4,75

6) $\frac{2x+1}{3}$ + $\frac{x+7}{2}$ = 5

$\frac{2(2x+1) + 3(x+7)}{6}$ = 5

$\frac{4x + 2 + 3x + 21}{6}$ = 5

$\frac{7x+23}{6}$ = 5 / *6

7x+23 = 30; 7x = 30 - 23; 7x = 7; x = 7/7; x = 1

1) x - y = 2

y = 1; x - 1 = 2; x = 3

y = 0; x - 0 = 2; x = 2

y = 2; x - 2 = 2; x =4

2) x + 3y = 0

y = 1; x + 3 = 0; x = -3

y = 2; x + 6 = 0; x = -6

y = 3; x + 9 = 0; x = -9

1) x - 2y = -8; x = -8 + 2y

2) 7x - y = 9; 7x = 9 - y; x = $\frac{9-y}{7}$

3) 5x - 7y = 12

5x = 12 + 7y

x = $\frac{12+7y}{5}$