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x = 15

Step-by-step explanation:

Angles in a triangle add up to equal 180

Hence, 3x + 5x + 4x = 180

( Note that we've just created an equation that we can use to solve for x)

We now solve for x using the equation created

3x + 5x + 4x = 180

Combine like terms

12x = 180

Divide both sides by 12

x = 15

x = 15

Step-by-step explanation:

The sum of the angles of a triangle is 180

3x+4x+5x = 180

Combine like terms

12x = 180

Divide by 12

12x/12 =180/12

x = 15

step-by-step explanation:

y = | -2(-2) |     →     y = | 4 |     →     y = 4       ⇒   (-2, 4)

y = | -2(-1) |     →     y = | 2 |     →       y =   2       ⇒   (-1, 2)    

y = | -2(0) |     →     y = | 0 |     →       y = 0         ⇒   (0, 0)

y = | -2(1) |   c →     y = | -2 |     →     y =   2         ⇒   (1, 2)    

y = | -2(2) |     →     y = | - 4 |     →     y =   4         ⇒   (2, 4)  

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step-by-step explanation: