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sergij07 [2.7K]
3 years ago
8

Year 9 Maths - linear equations please help

Mathematics
2 answers:
MAXImum [283]3 years ago
6 0
X=3, Y=9
X+Y=12
Y=X+6

X+X+6=12
2X=6
X=3

Y=3+6=9
jek_recluse [69]3 years ago
3 0

Answer:

x=1 & y=6 or (1,6)

Step-by-step explanation:

3x-x+5=7   Substitute the 2nd equation in for y  

2x+5=7      Do 3x-x to get 2x

2x=2          Subtract 5 from both sides

x=1              Divide 2 from both sides

y=1+5          Insert 1 as x

y=6             Add 1+5 to solve for y

Hope this helped!  

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HELP! I NEED THE ANSWER ASAP!!!!!
vladimir1956 [14]

Answer:

The solution to the given system of equations is (-2, -2).

Step-by-step explanation:

The given system of equations is,

2<em>x</em> + <em>y</em> = -6               .......(1)

-8<em>x</em> + 2<em>y</em> = 12            ......(2)

Now, we will make the coefficients of either <em>x</em> or <em>y</em> as opposites.

In the above system of equations, we will make the coefficients of <em>x</em> as opposites.

Multiplying equation (1) by '4' and equation (2) by '1', we get

8<em>x</em> + 4<em>y</em> = -24         .......(3)

-8<em>x</em> + 2<em>y</em> = 12          .......(4)

Now, we will add the equations (3) and (4).

  (8<em>x</em> + 4<em>y</em>) + (-8<em>x</em> + 2<em>y</em>) = -24 + 12

⇒8<em>x</em> + 4<em>y</em> - 8<em>x</em> + 2<em>y</em> = -12

⇒6<em>y</em> = -12

⇒<em>y</em> = \frac{-12}{6}

⇒<em>y</em> = -2

Now, substituting the value of <em>y</em> in equation (1), we get

  2<em>x</em> + (-2) = -6

⇒2<em>x</em> - 2 = -6

⇒2<em>x</em> = -6+2

⇒2<em>x</em> = -4

⇒<em>x</em> = \frac{-4}{2}

⇒<em>x </em>= -2

∴ <em>x</em> = -2; <em>y</em> = -2 is the solution of the given system of equations.

7 0
3 years ago
Write a proportion to find how many points x
Brilliant_brown [7]
80 percent multiplied by 80 is 64
he must get 64 points to obtain 80 percent of the mark
6 0
3 years ago
you have reading homework every 6 days and you have science homework every 15 days. If you have homework in both today when will
cluponka [151]
Do you remember when you were learning about the "Least Common
Multiple" of two numbers, and you were wondering why you had to learn
it, because you were so sure that you'd never need to use it ?  Do you
remember that ?

Well, HERE's where you get to use it.  This question is just looking for
the LCM of 6 and 15 .  THAT's how many days it will be before you get
homework in both subjects on the same day again.

(It's not 90 days, and it's not 60 days.)
8 0
3 years ago
I will give brainlist please someone help!!!​
Cerrena [4.2K]

Answer:

x = 6

Step-by-step explanation:

Alternate angles are congruent.

7x - 9 = 3x + 15               {Subtract 3x form both sides}

7x - 3x -9 = 15

      4x - 9=15            {Add 9 to both sides}

           4x = 15+9

           4x = 24

           x = 24/4

x = 6

6 0
3 years ago
Francesca has 63 cm of ribbon. She will cut it into two pieces so that the longer piece is 15 cm longer than the shorter piece.
Pie

Answer:

48

Step-by-step explanation:

63-15=48

6 0
3 years ago
Read 2 more answers
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