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kykrilka [37]
3 years ago
9

X + y = 3 3x + 4y = 3 using substitution how would you get x and y?

Mathematics
1 answer:
laila [671]3 years ago
3 0

Answer:

The solution is: (x, y) = (9, -7)

Step-by-step explanation:

Step 1: Solve one of the equations for either x = or y = . We will solve second equation for y.

x+y=3

y=3-x

Step 2: Substitute the solution from step 1 into the second equation.

3x+4(3-x)=5

Step 3: Solve this new equation.

3x+4(3-x)=5

3x+12-4x=3

-x+12=3

-x=3-12

x=9

Step 4: Solve for the second variable

y=3-x

y=3-9

y=-7

The solution is: (x, y) = (9, -7)

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4 0
3 years ago
PLEASE HELP
ruslelena [56]

Answer:

i believe the answer is 117$

Step-by-step explanation:7*15=105 8*1.50=12... 12+105=117

4 0
3 years ago
Please me answer this question
Alex73 [517]

Answer:

x=11, y=13

Step-by-step explanation:

3x-2y=7

3x-2(x+2)=7 .          - x + = -      -2*+2=-4

3x-2x-4=7

1x-4=7

x=7+4

x=11

y=x+2

y=11+2

y=13

8 0
3 years ago
Read 2 more answers
Do I set the equation up like this and then multiply the 2 on everything?
dybincka [34]
No no need to  take out the 2 
You can factor this by using the ac method

2x^2 + 3x - 5 = 0

multiplying the first and last coefficients 2 * -5 = -10
Now we want to get 2 factors of -10  which will give us  +3 when added:-
+5 and -2  seem ok so we write:-

2x^2 - 2x + 5x - 5 = 0

2x(x - 1) + 5 (x - 1) =0

(2x + 5)(x - 1) = 0

Solution is   x = -5/2  and x = 1
3 0
4 years ago
Mary has saved $17.50 in the past 3 weeks.at This rate , how much will she save in 15 weeks ?
Oksanka [162]

Answer:

$87.60

Step-by-step explanation:

Assuming that mary is on a fixed income rate, we can calculate that Mary is making approximately $5.84 per week.

17.50 / 3 = 5.833333.... -> <em>5.84</em>

Now we multiply this number by 15 to get the amount of money she saves over this time.

5.84 * 15 = <em>87.6</em>

<em>So, we can see that Mary has saved $87.60 in 15 weeks.</em>

3 0
3 years ago
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