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3 years ago

5

One number is 1/2 of another number. The sum of the two numbers is 21. Find the two numbers. Use a comma to separate your answer

s

1 answer:

Romashka-Z-Leto [24]3 years ago

3 0

2x=y
x+y=21
x+2x=21
3x=21
x=7
y=2x
y=14

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2 years ago

Read 2 more answers

How many solutions does this system have?

goblinko [34]

A system of equation may have one, zero or infinitely many solutions

The system of equation has no solutions

The systems of equation are given as:

$y = -6x - 5$

$-2y +7 = 12x$

Substitute -6x - 5 for y in $-2y +7 = 12x$

$-2(-6x - 5) +7 = 12x$

Open brackets

$12x + 10 +7 = 12x$

$12x + 17 = 12x$

Subtract 12x from both sides of the equation

$17 = 0$

The above equation is not true i.e. $17 \ne 0$

Hence, the system of equation has no solutions

Read more about solutions of equations at:

brainly.com/question/9338739

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2 years ago

Y is the midpoint of AB, The coordinates are A(-3,-7) and B(-1,1) What is the coordinate Y?

NISA [10]

The formla of a midpoint of AB:

$M\left(\dfrac{x_A+x_B}{2},\ \dfrac{y_A+y_B}{2}\right)$

We have A(-3, -7) and B(-1, 1). Substitute:

$x_M=\dfrac{-3+(-1)}{2}=\dfrac{-4}{2}=-2\\\\y_M=\dfrac{-7+1}{2}=\dfrac{-6}{2}=-3$

<h3>Answer: M(-2, -3)</h3>

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3 years ago