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4 years ago

Solve by substitution (show steps) -3x-4y=10 -6x+y=-16

1 answer:

6 0

1) -3x-4y=10 ==> - 3x = 10+4y ===> 3x= -10-4y==> x=(-10-4y)/3
Now replace x by its value in 2)

2) -6x+y=-16 ==> - 6[( - 10- 4y)/3] + y = -16 ==> -2[(-10-4y] +y =- 16
+20+8y+y =- 16==> 9y = - 16 - 20 ==> 9y = -36 & y = - 4.

Now replace y by (- 4) in any of the 2 equations & you will find x = 2

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Answer:

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3 years ago

Two runners are saving money to attend a marathon. The first runner has $112 in savings, received a $45 gift from a friend, and

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The right answer is: d.112 + 25m + 45 = 50 + 60m

Step-by-step explanation:

Let m be the number of months

For First Runner:

He already has 112 in savings and got 45 from a friend so these will be constant values and as he will be saving $25 each month so

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The value of m will give us the number of months after which the accounts of both runners will have same amount.

Hence,

The right answer is: d.112 + 25m + 45 = 50 + 60m

Keywords: Linear Equation, Variables

Learn more about linear equations at:

#LearnwithBrainly

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4 years ago

Read 2 more answers

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3 years ago

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3 years ago

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3 years ago