Elimination Method 7x=3y+45 4x+5y=19 (Show it step by step please!)

Answers

Answer 1

Answer:

$\left\{\begin{array}{ccc}7x=3y+45&|\text{subtract 3y from both sides}\n4x+5y=19\end{array}\right\n\left\{\begin{array}{ccc}7x-3y=45&|\text{multiply both sides by 5}\n4x+5y=19&|\text{multiply both sides by 3}\end{array}\right\n\underline{+\left\{\begin{array}{ccc}35x-15y=225\n12x+15y=57\end{array}\right}\qquad|\text{add both sides of the equations}\n.\qquad47x=282\qquad\text{divide both sides by 47}\n.\qquad \boxed{x=6}\n\n\text{Put the value of x to the second equation}$

$4(6)+5y=19\n\n24+5y=19\qquad\text{subtract 24 from both sides}\n\n5y=-5\qquad\text{divide both sides by 5}\n\n\boxed{y=-1}\n\nAnswer:\ \boxed{x=6\ and\ y=-1}$

Answer 2

Answer:

6,-1 this is the answer

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A line passes through (3, 7) and (6, 9). Which equation best represents the line? y = 3 over 2 x + 5 y = 2 over 3 x + 5 y = 3x + 2 y = 2 over 3 x +2

Answers

The slope is 2/3
The y-intercept is 5
so y = 2/3x + 5

Two equivalent forms of 3/5

Answers

To find an equivalent fraction, you can just easily multiply the numerator and the denominator by anything.

6/10 and 300/500 are equal, because I multiplied each by 2 and 100, respectively.

Which is the same as 0.08?

A) 80%
B) 80/100
C) 8%
D) 0.8

Answers

The correct answer is C because starting from decimal (the dot) , you move 2 spaces to your right and you will get 8%

D because the 0's mean nothing.

Which is the better unit to use to measure the capacity of a bathtub. milliliters or liters?

Answers

Liters is the best. A bathtub can hold a lot of water.

Please Help! 20 points!You can choose more than one answer
(I already know the second one is right but I need one more that is equivalent)

Which of the following equations are equivalent to -2m - 5m - 8 = 3 + (-7) + m?

1) -15m = -4m

2) -7m - 8 = m - 4

3) -3m - 8 = 4 - m

4) m - 4 = -7m - 8

5)-8 - 7m = -4 + m

6)-8 - 3m = 4 - m

Answers

Answer:

2 and 5 for sure. I think 4 is correct, but your teacher may not.

Step-by-step explanation:

The given expression reduces down to -7m - 8 = m - 4

1 cannot give -15m on the right. One seldom sees that mistake on Brainly.

3 does not do that. - 3m is not - 7m

4 has it's sides reversed. I would count it is right, others may not. I'm trying to say the left side is on the right side and the right side is on the left. That to me is OK.

5 is Ok as well the left is written as -8 - 7m which is -7m - 8. and with -4 and m

6 has been reduced on the left incorrectly. the right is it's signs backwards

2 4(?) and 5

Triangle KNM is isosceles, where angle N is the vertex.Isosceles triangle K N M is shown. N L is a perpendicular bisector of angle K N M. Angle K N L is (5 x + 10) degrees and angle L N M is (6 x minus 1) degrees.

What is the measure of angle K?
11º
25º
50º
65º