If you have multiple equations with multiple variables, you can either do clever substitutions, or turn it into a matrix on which you can perform linear combinations or multiplications (Gauss elimination)
1 1 1 1
2 1 -1 8
1 -1 1 -5
(note how the above 3 rows represent the 3 equations, just got rid of the variables, plus sign and equals sign)
subtract row1 from row3, that eliminates x and z from row 3.
1 1 1 1
2 1 -1 8
0 -2 0 -6
divide row3 by -2, that will give y a factor of 1
1 1 1 1
2 1 -1 8
0 1 0 3
The last row now says y=3
Answer:
Thanks, but join what?
Step-by-step explanation:
(32 + 90 + 92 + 82 + 64 + x) / 6 = 85
(360 + x) / 6 = 85
360 + x = 85 * 6
360 + x = 510
x = 510 - 360
x = 150 <===
Answer:
3 1st class tickets and 5 coach tickets
Step-by-step explanation:
1. Subtract 3630 (cost of 3 1st class tickets) from the budget to get 1000.
2. Subtract 1000 (cost of 5 coach tickets) from your remaining budget to get 0.
Answer:
D.1.121, 1.21, 1.432, 1.53
Step-by-step explanation:
Look at it as money:
$1.12
$1.21
$1.43
$1.53
We know that D states the money from least to greatest.
Or
We can convert them to fractions by Decimals can be written in fraction form. To convert a decimal to a fraction, place the decimal number over its place value. For example, in 0.6, the six is in the tenths place, so we place 6 over 10 to create the equivalent fraction, 6/10. If needed, simplify the fraction.
