Can you guys help me☺️?...2h-3j=-112h+j = 1what the answer?☺️

Mathematics

1 answer:

barxatty [35]2 years ago

6 0

Answer:

h = -1, j = 3

Step-by-step explanation:

Let's subtract the first equation from the second one:

(2h + j) - (2h - 3j) = 1 - (-11)

2h + j - 2h + 3j = 1 + 11

4j = 12

j = 12 : 4

j = 3

Then let's solve the second equation as we know j:

2h + 3 = 1

2h = -2

h = -2 : 2

h = -1

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A printer takes 30 minutes to print a banner and a poster. I will take 50 minutes to print a banner and three posters. How long

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Answer:

It takes the printer 20 minutes to print a banner

Step-by-step explanation:

Notice that there are two unknowns in this problem: the time to print a poster and the time to print a banner. Let's assign the letter "b" to the time it takes to print a banner, and "p' the time it takes to print a poster.

So we can write the following two equations involving the total amount of time that takes to print in the two cases:

$b+p=30\\b+3p=50$

We can solve for the unknown "p" by subtracting term by term in the equation set above:

$b+3p=50\\b+p=30\\\\b-b+3p-p=50-30\\2p=20\\p=10$

So it takes 10 minutes to print each poster, we can find the time it takes to print the banner by using the value we just found in one of the equations:

$b+p=30\\b+10=30\\b=20$