Hot Student Stories
top-5-grammar-and-spelling-checkers-to-rock-in-2019

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

Jennifer Patterson

in Mathematics

follow
followin
1 answer
4 views

1 answer


Blair Lewis on December 17, 2018

So we know Already that b is the same. We can just plug it into the equation b = 3 5a -10(3) = 45 the First step is to solve -10(3) which means that we have to multiply these two numbers. -10 x 3 = -30 Now plug that in to what it was in the equation. 5a - 30 = 45 Now, the next step is to add 30 to both sides to cancel -305a - 30 = 45 +30 = +30*************** Now, the 30 on the left side disappear and resolves on the right side. 45 + 30 = 75 Now set up the equation once more. 5a = 75 Now divide both sides by 5 to isolate (or get a stand alone) 5a = 75 ÷5 = ÷5 ********* the 5 on the left side disappear and resolves on the right side. 75 ÷ 5 = 15 So here we have it, to the left. a = 15 Good Luck! :)


Add you answer