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Agata [3.3K]
3 years ago
6

Solve the system of equations 3x – 3y = 30 and 2x + y = 11 by combining the equations.

Mathematics
1 answer:
Andreas93 [3]3 years ago
6 0
Times bottom equation by 3 and top by 2 to get the same coefficient of x
6x-6y=60
6x+3y=33
Minus the bottom by the top
-9y=27
y=-3
substitute this in to one of the equations
2x -3 = 11
add 3 to both sides
2x=14
x=7
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<h3>What is variation?</h3>

The discrepancy among an ideal and real scenario is referred to as the Law of Variation. The most frequent manifestations of variation or variability are changes in the data, anticipated results, or minor changes in the quality of the output.

The types of variation are given below-

  • Where a variable is a fixed multiple of another, this is known as direct variation. For instance, my income varies directly (or proportionally) with the amount of hours I put in.
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According to the question;

A quantity m varies jointly with p and r which shows that p and r in joint variation with m.

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