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vaieri [72.5K]
3 years ago
8

Need help pls solve 7x-4y=-7 5x+y=22

Mathematics
2 answers:
Vinil7 [7]3 years ago
8 0
I think this would be the correct answer <span>{x,y} = {3,7}</span><span> </span><span />
aev [14]3 years ago
3 0
<span>7x-4y=-7
5x+y=22

multiply 4 on the 2nd equation
</span>20x+ 4y=88

now you have
7x -4y = -7 
20x + 4y = 88
--------------------add
27x = 81
x = 3

7x-4y=-7
7(3)-4y=-7
-4y = -28
y = 7

answer (3, 7) is the solution
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Read 2 more answers
Solve for x:<br> 4x – 7 = 8x + 33
Lera25 [3.4K]

Answer:

x = 10

Step-by-step explanation:

Hey there!

To solve this question we will use PEMDAS (order of operations)

4x−7=8x+33

Subtract 8x from both sides.

4x−7−8x=33

Combine 4x and −8x to get −4x.

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Add 7 to both sides.

−4x=33+7

Add 33 and 7 to get 40.

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x= 40/-4

Divide 40 by −4 to get −10.

x=−10

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