jasssminne jasssminne

12-06-2018
Mathematics

contestada

5a - 10b =45 when b=3?

Respuesta :

vidalmari6p99qfk vidalmari6p99qfk

12-06-2018

a=15

(-10b = -30)

5a-30=45

5a=75 (45+30)

a=15

75-30 = 45

Answer Link

12-06-2018

Hey there! :)

First, substitute b with 3 and multiply by 10

10 × 3 = 30

Here is the new equation:

5a - 30 = 45

45 + 30 = 75

5a = 75

Divide both by 5

5a ÷ 5 = a
75 ÷ 5 = 15

a = 15

Hope this helps :)

Answer Link

Otras preguntas

Aiden wrote a riddle: Five less than 1/5 times a number is same as the sum of the number and 1/3. Find the number

Susan ........ (Run) to school because she was late.

i need help with this question

On Being Brought from Africa to America by Phillis Wheatley 'Twas mercy brought me from my Pagan land, Taught my benighted soul to understand That there's a God

why is it critical to your cells to be near capillaries

Dalia has just enough money to buy either 6 pears and 20 oranges or 12 oranges and 11 pears. A pear costs $ 0.80. How much does an Orange cost ?

the reproductive system of a male mammal provides

What property is shown by the equation? 1. 0 ÷ (–6) = 0

a pine tree measured 40 and 1 over 2 feet tall. Over the next 7 and 1 over 2 years it grew to a height of 57 feet. During the 7 and 1 over 2 years, what was the

four yardequal Blank feet