Let...
x=the number of red bricks
y=the number of blue bricks
Since she bought a total of 100 bricks... x+y=100.
Because the total cost is $560... 5x+7y=560.
Using these two equations, we can use the substitution method to solve for x and y.
x+y=100 ------------------------> x=100-y
subtract y on both sides
Because x=100-y...
this is x
5x+7y=560 (second equation) equals 5( 100 - y )+7y=560
This equation we created has only one variable so we can solve it.
5(100-y)+7y=560
500-5y+7y=560
2y+500=560
2y=60
y=30 blue bricks
Because x=100-y... x=100-30=70 red bricks.
Yes, because they are like terms. So the answer would be 14x (like normal addition since it’s like terms)
The answer is in the picture. To be honest, I am not 100% sure about it.
The equation given is:
.
The second equation will have x as the unknown equivalent numerator with the denominator as (a-6)(a-1)(a+6).
Simplifying the second equation would result to:
Equating the two equations:
x = 6(a+6). The numerator of the equivalent equation is 6(a+6).
(20 + 12) - 8, since the question states n is EIGHT less than the sum of 20 and 12.