Answer:
REflection over the y axis
Step-by-step explanation:
When you reflect over the y axis, you change the x coordinate from a positive to a negative. The opposite goes for the reflection over the x axis
The fish’s location relative to the surface of the ocean is -85
Answer:
x=3
y=6
Step-by-step explanation:
The goal of the elimination method is to cancel out one of the variables when the equations are added or subtracted. Let's say we will cancel out the two "x" first. Multiply both of the equations entirely so that the "x" is the same.
{7x - 4y = -3} *3 => 21x - 12y = -9
{3x - 9y = -45} *7 => 21x - 63y = -315
Subtract the first equation from the second equation. Subtract each term separately and remember subtracting a negative number becomes adding.
. 21x - 12y = -9
<u>- 21x - 63y = -315</u>
. 0x + 51y = 306 Notice x variable cancels out
. 51y = 306 <= Divide both sides by 51
. y = 6
Substitute y=6 into any of the equations. Then isolate x. I will use 7x-4y=-3
.
7x - 4y = -3
7x - 4(6) = -3 <=simplify
7x - 24 = -3 Start isolating x by bringing everything to the right side
7x = -3 + 24 <=add 24 to both sides. This cancels out 24 on the left.
7x = 21 <=divide both sides by 7
x = 3
The solution of the system is (3, 6).
<em><u>Question:</u></em>
At the market, 5 light bulbs cost $9. How much do 7 light bulbs cost?
<em><u>Answer:</u></em>
Cost of 7 bulbs is $ 12.6
<em><u>Solution:</u></em>
Given that,
5 light bulbs cost $ 9
Find the cost of 1 bulb
Cost of 1 bulb is found by dividing the cost of 5 bulbs by 5
Thus cost of 1 bulb is $ 1.8
<h3><u>Find the cost of 7 bulbs:</u></h3>
Thus cost of 7 bulbs is $ 12.6
4(x+x+7) x=1
4(1+1+7)
4+4+28 = 36
(-2x+7-4) x=2
-2(2)+7-4
-4+7-4 = -1