PLEASE HELP ASAP!!! MARKING BRAINLIEST! Please don't put something silly...I only need the Substitution column.

Mathematics

2 answers:

SOVA2 [1]3 years ago

8 0

This is for the first one :) sorry I don’t have time to do the other two, but this will help with the other ones

harkovskaia [24]3 years ago

7 0

When the answer is 0 is equal to 0, it means that the equations are the same and that any value will work! hope this helps!

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Please help me with these questions

RoseWind [281]

Answer:

angle 6 is 135 degrees

Step-by-step explanation:

6 and 7 are supplementary angles meaning that together they equal 180.

180-65=135

5 0

3 years ago

Plz help ASAP!! Explain your answer! I will mark at brainliest!!!

Rina8888 [55]

Answer:

A. 16.12 ft B. 9.64 ft

Step-by-step explanation:

For both of these, you need Pythagorean's Theorem because we have right triangles. In part A, we are given 2 legs and are asked to find the length of the hypotenuse:

$14^2+8^2=PR^2$ and

$196+64=PR^2$

and PR = 16.12 ft

In part B, we are given the length of the hypotenuse and side PQ remains the same:

$14^2+QR^2=17^2$ and

$196+QR^2=289$

$QR^2=289-196$ so

QR = 9.64 ft

3 0

3 years ago

The perimeter of a rectangle is 42 cm. The width is 7 cm less than the length.

lara [203]

Answer:

<h2>Length = 14</h2><h2>Width =7</h2>

Step-by-step explanation:

$Let \:the\:length\:be \:x\\Perimeter = 42 cm\\Width = x -7\\\\P = 2(l+b)\\\\42 = 2(x+(x-7))\\\\42 = 2(x +x-7)\\42 = 2(2x-7)\\42 = 4x -14\\Collect\:like\:terms\\\\42+14=4x\\56 = 4x\\\\Divide \:both\:sides\:of\:the\:equation\:by \:4\\\frac{56}{4} = \frac{4x}{4} \\\\14 =x\\Length = 14\\Width = x-7\\Width = 14-7\\\\Width = 7$