Super i need ! 1 ! use the linear combination method to solve the system of equations. explain each step of your solution. 3x-8y=7" " " " x+2y=-7

x=-3,y=-2

Step-by-step explanation:

Given 2 expressions

S1:

S2:

Write one equation in terms of any variable (x or y)

Here I am writing S1 in terms of y

Substitute this value of y as the value of y in S2

⇒

Therefore

Substitute this value of x in any of the expressions S1 or S2

Here i am substituting in S2

⇒

Therefore x=-3 and y=-2

i believe it is 0.1m because the measurement of 30.4m limits how precise you can be

you can only be as precise as the least precise measurement

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15