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Alex787 [66]
3 years ago
9

Solve the system: {4x-7y=30, 4x-5y=90

Mathematics
1 answer:
Lerok [7]3 years ago
7 0

Answer:

x=60, y=30

Step-by-step explanation:

4x-7y=30

4x-5y=90

Subtract the equations

4x-7y=30-4x-5y=90

=2y=60

Solve 2y=60

Divide both sides by 2

2y/2=60/2

Simplify;

y=30

For 4x-7*30=30 for x

4x-7y*30=30

Multiply the numbers:7*30=210

4x-210=30

Add 210 to both sides

4x-210+210=30+210

Simplify;

4x=240

Divide both sides by 4

4x/4=240/4

Simplify

x=60

The solutions to the system of equations are:

x=60, y=30

Hope this helped!!!

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Answer:  It takes 4 person 230 mins to paint 6 walls

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HOPE I HELPED

PLS MARK BRAINLIEST

DESPERATELY TRYING TO LEVEL UP

                   ✌ -ZYLYNN JADE ARDENNE

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3 years ago
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