Tolong di jawab ya kakak, buat pr bsk hehe.
1) 20: (-2)+5=
2)7+(-5)x5=
3)13x(-)=
4)8+(-12): 4=
5)30: (-6)x(-2)=

1) 20 : (-2) + 5 = -5

2) 7 + (-5) × 5 = -18

3) 13 × (-4) - (-3) = -49

4) 8 + (-12) : 4 = 5

5) 30 : (-6) × (-2) = 10

Step-by-step explanation:

* Lets revise the order of the operation

- In any problem contains addition , subtraction , multiplication and

 division, then the order of operations is multiplication or division

 whose come first at first and addition or subtraction whose come

 first at second

* Lets solve the problem

1) 20 : (-2) + 5

- At first solve 20 : (-2) ⇒ (20 ÷ (-2))

∵ 20 : (-2) = -10

∴ 20 : (-2) + 5 = -10 + 5

∵ -10 + 5 = -5

∴ 20 : (-2) + 5 = -5

2) 7 + (-5) × 5

- At first solve (-5) × 5

∵ (-5) × 5 = -25

∴ 7 + (-5) × 5 = 7 + (-25)

∵ 7 + (-25) = -18

∴ 7 + (-5) × 5 = -18

3) 13 × (-4) - (-3)

- At first solve 13 × (-4)

∵ 13 × (-4) = -52

∴ 13 × (-4) - (-3) = -52 - (-3)

∵ - (-3) = + 3

∴ 13 × (-4) - (-3) = -52 + 3

∵ -52 + 3 = -49

∴ 13 × (-4) - (-3) = -49

4) 8 + (-12) : 4

- At first solve (-12) : 4

∵ (-12) : 4 = -3 ⇒ (-12 ÷ 4)

∴ 8 + (-12) : 4 = 8 + (-3)

∵ 8 + (-3) = 5

∴ 8 + (-12) : 4 = 5

5) 30 : (-6) × (-2)

- At first we will start with the division because it becomes first

∵ 30 : (-6) = -5

∴ 30 : (-6) × (-2) = (-5) × (-2)

∵ (-5) × (-2) = 10

∴ 30 : (-6) × (-2) = 10

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation:

-9

step-by-step explanation: