All categories

4 years ago

Ii dont understand how to solve a system of linear equations using the substitution method

1 answer:

8 0

So 8x-7y=-7
-16+12x=14
you can simplify the sceon equation
-8+6x=7
add 8 to both sides
6x=15
divide by 6
x=15/6
subssitute
8(15/6)-7y=-7
120/6-7y=-7
20-7y=-7
subtract 20
-7y=-27
divide by -7
y=27/7

x=15/6
y=27/7

You might be interested in

Consider the table representing an exponential function.

Gnesinka [82]

Answer: f(x) is just a fancy way of writing y in an equation

Step-by-step explanation:

Example: f(x)= 2x+4 is the same as y= 2x+4

8 0

3 years ago

Solve for x <br> filler filler filler filler filler filler

BigorU [14]

Answer:

x = -3

Step-by-step explanation:

x + x + x = 3 x

3 x + -3 = -12

-12 - -3 = 9

3x = -9

x = -9 ÷ 3 = -3

4 0

3 years ago

A cell phone tower casts a shadow 15 feet long at the same time that a 100-foot building casts a shadow 60 feet long. How tall i

aivan3 [116]

Answer:

27 feet tall

Step-by-step explanation:

100/60

10/6

4 0

3 years ago

An equation used to solve a problem was (original amount)(0.30) = 48

romanna [79]

Answer:

Step-by-step explanation:

A commission of $48 was earned on the sale of a camera. If a 30% commission rate is given, what was the price of the camera sold

A camera was on sale for 30% off, and the discount was $48. What was the original price of the camera

The markup on a camera was $48 at a rate of 30%. What was the wholesale price of the camera

4 0

4 years ago

If 2x – 3 + 3x = – 27, what is the value of x?

aksik [14]

Answer:

x = -24/5

Step-by-step explanation:

2x – 3 + 3x = – 27

Combine like terms

5x -3 = -27

Add 3 to each side

5x-3+3 = -27+3

5x = -24

Divide each side by 5

5x/5 = -24/5

x = -24/5

6 0

4 years ago

Read 2 more answers