Mathematics, 02.04.2020 04:40, destineenikole175

3. Is the equation true, false or open?

3y + 6 = 5y − 8

Now it’s your turn (Practice):

4. Is (5,15) a solution of the equation y = 3x?

5. Is (3,1) a solution of the equation y = −x + 3

Solve each equation. Check your answer.

7. −4 = z + 3

8. z − 10 = −1

9. 2.5 = 2x

10. −5 = z7

11. −15 = 52x

Answers: 2

Show answers

Answers

answered: ToxicMonkey

3. ∴ Equation is y-7=0.

4. LHS = RHS Hence, (5, 15) is a solution of a given equation.

5. LHS ≠ RHS Hence, (3, 1) is not a solution of a given equation.

7. z=-7

8. z=9

9. x=1.25

10. $z=\frac{-5}{7} =-0.71428$

11. $x=\frac{-15}{52} =-0.28846$

Step-by-step explanation:

3. We have given the equation 3y+6=5y-8 . Now, solving the given equation we get,

⇒ 5y-3y=6+8

⇒ 2y=14

⇒ y=7

∴ Equation is y-7=0.

4. Given point is (5, 15) , where x=5 and y=15 .

Now equation is y=3x

⇒ y-3x=0 (...)

now putting the value of and in equation (1), we get

⇒ $15-3\times5=0$

⇒ 0=0 Here LHS = RHS Hence, (5, 15) is a solution of a given equation.

5. Given point is (3, 1) , where x=3 and y=1 .

Now equation is y=-x+3

⇒ y+x-3=0 (...ii)

now putting the value of and in equation (11), we get

⇒ 1+3-3= 0

⇒ $1\neq 0$ Here LHS ≠ RHS Hence, (3, 1) is not a solution of a given equation.

7. Given equation is -4=z+3

⇒ z=-4-3

⇒ z=-7

8. Given equation is z-10=-1

⇒ z=-1+10

⇒ z=9

9. Given equation is 2.5=2x

⇒ $x=\frac{2.5}{2}$

⇒ x=1.25

10. Given equation is $-5=z\times7$

⇒ $z=\frac{-5}{7} =-0.71428$

11. Given equation is -15=52x

⇒ $x=\frac{-15}{52} =-0.28846$

answered: Guest

Best answer that i found on yahoo ok set : x= length of 2nd piece in cm x- 3= length of 1st piece in cm x-4= length of 3rd piece in cm then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20 3x - 7= 20 3x= 27 x= 9 the shortest piece is the third piece which is x- 4 x-4 9-4 = 5 the length of the smallest piece is 5 cm. the other lengths are 9 cm 6 cm

answered: Guest

the answer will be b x² +x-1

step-by-step explanation:

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3. Is the equation true, false or open?

3y + 6 = 5y − 8

Now it’s your turn...