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kipiarov [429]
2 years ago
12

Need help quick! Will give brainliest to first right answer.

Mathematics
1 answer:
alexgriva [62]2 years ago
8 0

Answer:

the first one  or the last one

Step-by-step explanation:

5x+5y = 10 and 2x+2y=4

0 = 0

3x-6y = 4 and - 4x+8y=7

0 = 37 / 3

6x+2y = 6 and 7x+3y=9

0 = 3

3x-4y = 16 and 2x+3y = 5

x=4 and y=−1

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2 years ago
1. Mark and Bill have a combined weight of 170
qwelly [4]
<h3>Equation : x + y = 170 and y = 2x - 40</h3><h3>The weight of Bill is 70 pounds and weight of mark is 100 pounds</h3>

<em><u>Solution:</u></em>

Let the weight of Bill be "x"

Let the weight of mark be "y"

Given that,

Mark and Bill have a combined weight of 170  pounds

Therefore,

x + y = 170 ------- eqn 1

Mark weighs 40 pounds less than twice Bill's  weight

y = 2x - 40 ------- eqn 2

<em><u>Substitute eqn 2 in eqn 1</u></em>

x + 2x - 40 = 170

3x = 170 + 40

3x = 210

x = 70

<em><u>Substitute x = 70 in eqn 2</u></em>

y = 2(70) - 40

y = 140 - 40

y = 100

Thus weight of Bill is 70 pounds and weight of mark is 100 pounds

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3 years ago
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