Solving by Substitution y=-2+1 2x-2y=4

2 answers:

7 0

2x-2(-2+1)=4
Distribute the -2 to the numbers in parantheses.
2x+4-2=4
Combine all numbers
2x+2=4
Subtract 2 from both sides
2x=2
Then divide by two
x=1

Alina [70]3 years ago

3 0

X = 1
and....
y = -1 + y = 3
I hope this helps! :)

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Simplify the following:<br>A) 3² x 3² <br>B) 7 x 7⁴<br>C) 10⁹ ÷ 10⁷<br>D) 5⁸ ÷ 5<br>

Rus_ich [418]

Answer: A) 81

B) 16807

C) 100

D) 78125

Step-by-step explanation:

A) = 3^4 or 81

B) = 7^5 or 16807

c) = 10^2 or 100

D) = 5^7 or 78125

8 0

3 years ago

What is the gradient of the line 3x+y=4

algol13

Answer:

<h2>The slope is - 3</h2>

Step-by-step explanation:

Equation of a line is y = mx + c

where

m is the slope

c is the y intercept

The equation is 3x+y = 4

To find the slope of the line we must first write the equation in the general form above

Make y the subject

That's

y = - 3x + 4

Comparing with the general equation above

Slope of the line = - 3

Hope this helps you

3 0

4 years ago

Margaret's bottle of shampoo is seven eights phone. She uses 1/3 of the shampoo in the bottle to wash the dog. Estimate what fra

guajiro [1.7K]

Fraction of shampoo left = $\frac{13}{24}$

Solution:

Given fraction of full shampoo $=\frac{7}{8}$ .

Fraction of shampoo Margaret used $=\frac{1}{3}$

Fraction of shampoo left = Full shampoo – fraction of shampoo used

$=\frac{7}{8}-\frac{1}{3}$

To make the denominators same do cross multiplication.

$\begin{aligned}&=\frac{7 \times 3}{8 \times 3}-\frac{1 \times 8}{3 \times 8}\\&=\frac{21}{24}-\frac{8}{24}\\&=\frac{21-8}{24}\\&=\frac{13}{24}\end{aligned}$