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3 years ago

Hi, I need help with a practice SAT question on math. The problem is in the picture.

Mathematics

1 answer:

bagirrra123 [75]3 years ago

3 0

Answer:

2.5

Step-by-step explanation:

The equation will have infinite solutions when it is a tautology--when both sides say exactly the same thing.

Eliminate parentheses, match coefficients, and solve for b.

ax +ab = 4x +10

a = 4 . . . . . . coefficient of x

ab = 10 . . . . constant

Since we know a, we can find b:

4b = 10

b = 10/4 . . . . . . . divide by 4

b = 5/2 = 2.5 . . .express in your favorite form

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En que consiste la jerarquía de operaciones?

ruslelena [56]

Answer:

La jerarquía de operaciones es un método para resolver operaciones con múltiples operadores; saber realizarla te servirá para resolver los diversos problemas que te presenten en tu examen CENEVAL EXANI-II. En primer lugar, se deben resolver las operaciones de potencias y raíces.

Step-by-step explanation:

7 0

3 years ago

How do You supposed to do this i need many method to do it.

defon

I like the substitution method. Which is when you make one equation equal only x or y and plug it into the other equation)

There is also the graphing method. If you graphed it, it might not be quite as accurate (at least on hand, on computer you would be pretty exact)

Then there is the elimination method. You multiply one of the equations by a coefficient so that you can eliminate x or y from the equation.

4 0

3 years ago

A bank loaned out $19,000, part of it at the rate of 9 % per year and the rest at 19 % per year. If the interest received in o

VMariaS [17]

Answer: $11100 was loaned at 9%

Step-by-step explanation:

Let x represent the amount that the

bank loaned out at the annual rate of 9%.

Let y represent the amount that the

bank loaned out at the annual rate of 19%.

The bank loaned out $19,000, part of it at the rate of 9% per year and the rest at 19% per year. It means that

x + y = 19000

The interest on $x after 1 year would be

9/100 × x = 0.09x

The interest on $y after 1 year would be

19/100 × y = 0.19y

If the interest received in one year totaled $2500. It means that

0.09x + 0.19y = 2500- - - - - - - - - 1

Substituting x = 19000 - y into equation 1, it becomes

0.09(19000 - y) + 0.19y = 2500

1710 - 19000y + 0.19y = 2500

- 0.09y + 0.19y = 2500 - 1710

- 0.1y = - 790

y = - 790/- 0.1

y = $7900

x = 19000 - y = 19000 - 7900

x = $11100

7 0

3 years ago

If y=-5 when x=2,find y when x=8

LenaWriter [7]

You can’t really know the y value unless you’re told that they’re both directly proportional. if so, then check out the pic

5 0

3 years ago

Please help me find the slope of the line graphed below!

valentinak56 [21]

Answer:

slope = - 3

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (- 1, 0) and (x₂, y₂ ) = (0, - 3) ← 2 points on the line

m = $\frac{-3-0}{0+1}$ = $\frac{-3}{1}$ = - 3

8 0

3 years ago

Read 2 more answers