2 years ago

3x + 5y = 7 -3x - 2y = -1

Mathematics

1 answer:

Oksanka [162]2 years ago

6 0

Answer:

(-1,2) y=2 x=-1

Step-by-step explanation:

This is a system of equations and in this you see there is 3x and negative three x. To solve this you need tp get rid of one of the variables. so we can add the two equations together to get 3y=6. This means that y=2 if we divide by 3 on both sides. Then we just plug 3 in for y and we get 3x+10=7. We subtract 10 on both sides to get 2x=-3 which means x=-1.

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A recipe calls for 2 3/4 cups of milk. if the recipe is tripled, how much milk is needed?

SSSSS [86.1K]

To be tripled means to be multiplied by 3. So multiply 2 3/4 by 3
2 3/4*3=8 1/4
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5 0

3 years ago

When solving this equation: -16 + x = -15 we start with adding 16 to both sides. Why do we use addition?

Ierofanga [76]

Answer:

So you can cancel out the 16. See, the -16 is negative, and if we add +16 to it, then it cancels out and is 0. That way, you have x=1.

Step-by-step explanation:

-16x+x=-15