Answer:
(2x+7) + (4x+1)
Step-by-step explanation:
(3-2x+4) + (4x-5+6)
(2x+7) + (4x+1)
Answer:
It'll simplify the calculation process.
Step-by-step explanation:
It'd be much harder to solve the problem "1/4 x 14" or "25% x 14" than just calculating "0.25 x 14". It'll also help you work on converting to different forms of numbers. Depending on the problem, you'll need to convert to a specific form, such as a problem that asks you to calculate the percent increase/decrease. If you answered with your number in decimal or fraction form, you haven't completely answered the problem. I hope this helps and sorry if it wasn't in enough detail! ♥️
Their are 2 main methods of solving 2 equations with 2 variables:
1) SUBSTITUTION
2) ELIMINATION
I'll show you both:
1) y = 2x + 160
y = - 3x + 208
plug what y is equal to in 1st equation into the y of the 2nd:
2x + 160 = -3x + 208
2x + 3x + 160 = -3x + 3x + 208
5x + 160 -160 = 208 - 160
5x = 48
5x/5 = 48/5
x = 48/5 = 9 3/5
now plug that x into either one of the original equations: y = -3x + 208 = -3(48/5) + 208
y = -144/5 + 208 = 1040/5 - 144/5 = 896/5
y = 179 1/5
2) add the whole equations together so as to cancel out one of the variables:
I'm choosing to eliminate the y, so we need y-y to remove the y's, I'll multiply the whole 2nd equation by -1 to make that -y
-1 (y = - 3x + 208)
-y = 3x - 208
So set it up like:
y = 2x + 160
-[y = 3x - 208]
---------------------
0 = 5x - 48
0+48 = 5x -48 +48
5x = 48
5x/5 = 48/5
x = 48/5
plug that x value into one of the original equations: y = 2x + 160 = 2(48/5) + 160
y = 96/5 + 160 = 96/5 + 800/5 = 896/5
y = 179 1/5
SO WE GOT THE SAME VALUES BOTH WAYS.
WHEN YOU SEE FUTURE PROBLEMS LIKE THESE, SOME WILL BE QUICKER BY ELIMINATION AND OTHERS BY SUBSTITUTION
Answer: Rs 150 profit.
Step-by-step explanation: if 10 books went for Rs 40 each, you multiply 10 by 40 to get Rs 400. Then you subtract 10 books from 40 books to get 30 books which were the remaining ones that went for Rs 45 each. You then have to multiply 30 by 45 to get Rs 1350 for 30 books which you will then add to Rs 400 to get Rs 1750 which was the total amount of money all the books went for. You can now then subtract Rs 1600 from Rs 1750 to get Rs 150 which was the profit made.
Answer: 0.2
Step-by-step explanation: