Question

Solving more systems

Answer 1

so the first thing you got to do is substitute the y. then you get 4x + 6x equals 7 . you acted like terms 6X + 4x equals 10 x and you bring everything down . then you divide 10 on both sides and then u divide 10÷7 u get 0.7. x=0.7

Answer 2

Hello from MrBillDoesMath!

Answer:

Problem 1: x = 7/10, y = 21/5

Problem 2: x = 10, y = 30

Discussion:

Problem 1: Substitute (y = 6x) in (4x + y = 7 ) to get

"4x + y = 7"

4x + (6x) = 7 =>

10x = 7 =>

x = 7/10

As y = 6x, y = 6(7/10) = 42/10 = 21/5 = 4 1/5

Problem 2:

Substitute (y = 3x) in (x = -2y + 70 ) to get

"x = -2y + 70"

x = -2(3x) + 70 =>

x = -6x + 70 => add 6x to each side

x + 6x = -6x + 6x + 70 =>

7x = 70 =>

x = 70/7 = 10 =>

y = 3x = 3(10) = 30

Thank you,

MrB