3 years ago

Solve the system using elimination 4x-7y=3 x-7y=-15

Mathematics

2 answers:

BigorU [14]3 years ago

6 0

The answer is 6,3
.......

ehidna [41]3 years ago

5 0

Answer: x=6 and y=3

Step-by-step explanation:

4x - 7y = 3 -------(1)

x - 7y = -15 ------(2)

equation(1) - equation (2)

3x = 18

Divide bothside by 3

x = 18/3

x= 6

also, multiply equation (2) by 4

4x - 28y = -60--------------(3)

subtract equation(3) from equation(1)

21y = 63

divide bothside by 21

y = 63/21

y = 3

You might be interested in

All of the following expressions have the same value, when x = -2 and y = 4, except _____.

Natali [406]

Answer:

-2xy

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

In applications, we consider any event that has below 5% chance. Pick a card from a standard deck of 52 cards. A=The card is an

9966 [12]

Answer:

Step-by-step explanation:

P(A) = 4/52 = 0.07692 which is bigger than 5%

5% = 0.05

0.07 is above 5% which is surprising.

The P(Spade A) = 1/52 = 0.01923 which is under 2% which meets your criteria.

8 0

3 years ago

PLEASE HELP!!!<br> Identify the side or angle that is common to ∆ABC and ∆CDA.

Sedbober [7]

Answer:

Step-by-step explanation:

both triangles contain this side

6 0

3 years ago

What is sin45°*sin30°*cos60°

NNADVOKAT [17]

Answer:

$\frac{\sqrt{2} }{8}$

Step-by-step explanation:

Using the exact values of the given trig functions, then

sin45° × sin30° × cos60°

= $\frac{\sqrt{2} }{2}$ × $\frac{1}{2}$ × $\frac{1}{2}$ = $\frac{\sqrt{2} }{8}$

6 0

2 years ago

Please help me! Will give points and mark brainliest answer. I have been stuck on this for a while too. Will give 30 points.

garri49 [273]

Answers:

1A. You see, every amount of T shirts costs 5.5 times more than it's amount. So if "n" is the number of shirts and "C" is what it costs, then the equation must be C=5.5n.

1B. Idon't know how to graph it here sorry.

1C. You have to look back to the equation. It has our coefficient (5.5n) on one side and C on the other,so the answer is just 5.5n. Now the questions says 120 shirts so (120)5.5 equals 660.

1D. I just did

7 0

3 years ago