Substitution. (6 points)3x + 2y = 12y = 2x − 1plz help (with work)

Mathematics

1 answer:

stellarik [79]3 years ago

8 0

The answer for #1 is y = - 3/2 x + 6

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Us the substitution method: x+1/9y=11 18x+2y=90

bonufazy [111]

To use it, we must solve for 1 variable

it seems to be that they want us to solve for x in firsr equation

x+1/9y=11
minus 1/9y from both sides
x=11-1/9y

sub 11-1/9y for x in other equation

18(11-1/9y)+2y=90
distribute
198-2y+2y=90
198=90
false

therefor there is no solution
(if we were to graph them they would be paraalell, if we rewrote them,they look like this: 18x+2y=192 and 18x+2y=90, obviously, there is no solution)

answer is no solution

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If Sarah invests $4,151 at a 9.3% simple annual interest rate, approximately how many years will it take for her to have over $7

Norma-Jean [14]

Answer:

Step-by-step explanation:

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3 years ago

Write an equation of the line below.

Lubov Fominskaja [6]

Answer (assuming it can be in slope-intercept form):

$y = \frac{4}{5} x$

Step-by-step explanation:

1) First, find the slope of the line. Use the slope formula $m = \frac{y_2-y_1 }{x_2-x_1}$ and substitute the x and y values of two points on the line into it. We can see that the line passes through (0,0) and (5,4), so let's use those points for the formula and solve:

$m = \frac{4-0}{5-0} \\m = \frac{4}{5}$

So, the slope is $\frac{4}{5}$ .

2) Next, identify the y-intercept of the line. The y-intercept is the point at which the line intersects the y-axis. We can see that the line intersects the y-axis at (0,0), so that must be the y-intercept.

3) Now, write the equation of the line in slope-intercept form using the $y = mx + b$ format. The number in place of $m$ represents the slope, so substitute $\frac{4}{5}$ in its place. The number in place of $b$ represents the y-intercept, so substitute 0 in its place. This gives the following answer and equation: