Answer:
x = -3, y = -4
(-3, -4)
Step-by-step explanation:
solve each equation for y (the first equation is already solved for y, so just do the second equation)
-x -y =7
<u>+x +x</u>
-y = x + 7 eliminate the negative by switching all signs
y = -x - 7
now that both equations equal y, you can set them equal to each other:
-x - 7 = 3x + 5
solve for x
-x - 7 = 3x + 5 move the variable to one side of the equation
<u>+x +x </u>
-7 = 4x + 5 move the constant to the other side of the equation
<u>-5 -5</u>
-12 = 4x single out x by dividing the whole thing by 4
<u>÷4 ÷4</u>
-3 = x
now substitute -3 for x in one of the original equations (it doesn't matter which equation)
y = 3(-3) +5 solve
y = -9 +5
y = -4
have a wonderful day! :)
Answer:
The line passing through (-8, 10) and (-1, 4).
Step-by-step explanation:
Two lines are perpendicular if the product of their slopes is -1. The slope of the line in the picture is
, so we should find a line with slope of
.
Note that the slope of the line in the last option is
.
Let's say a stands for apples and p for pears
We know that

And

In order to know what the cost of an "a" is we have to put the value of the p in the second equation, which means



And

The price of per kilo for apples is 1.80