What is the value of a in the equation 5a – 10b = 45, when b = 3?

5a – 10b = 45

Substitute b = 3 into the equation

5a – 10(3) = 45

5a - 30 = 45

5a = 75

a = 15

a = 15

If b = 3 you substitute al the b's on the equation by 3:

5a - 10(3) = 45 - you substitute b for 3

5a - 30 = 45 - you do 10 * 3

5a = 45 + 30 - you move 30 to the right side of the equation

5a = 75 - you do 45 + 30

a = - you take 5 to the right side of the equation

a = 15

Hope it helped,

Happy homework/ study/ exam!

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !

1.true 2.false? ? i think. .

step-by-step explanation: