If 4x+5y=10, and 2x+3y=8, then 3x+4y

= what? help me pls!

4x+5y=10

2x+3y=8

x = -5
y = 6

Now just find 3x+4y

To find the value of 3x+4y, we first need to solve the given system of equations:

Equation 1: 4x + 5y = 10
Equation 2: 2x + 3y = 8

We can use the method of substitution in this case. Let's solve Equation 2 for x:

2x + 3y = 8
2x = 8 - 3y (Subtract 3y from both sides)
x = (8 - 3y)/2 (Divide both sides by 2)

Now substitute this value of x in Equation 1:

4((8 - 3y)/2) + 5y = 10 (Replace x with (8 - 3y)/2 in Equation 1)

Simplifying this equation:

(16 - 6y) + 5y = 10 (Distribute 4 to (8 - 3y)/2)
16 - y = 10 (Combine like terms: -6y + 5y = -y)
-y = 10 - 16 (Subtract 16 from both sides)
-y = -6 (Simplify: 10 - 16 = -6)
y = 6 (Multiply both sides by -1 to isolate y)

Now, substitute this value of y back into Equation 2 to find x:

2x + 3(6) = 8 (Replace y with 6 in Equation 2)
2x + 18 = 8 (Multiply: 3 * 6 = 18)
2x = 8 - 18 (Subtract 18 from both sides)
2x = -10 (Simplify: 8 - 18 = -10)
x = -5 (Divide both sides by 2)

Now that we have found the values of x and y, we can substitute them into 3x+4y to get the final answer:

3x + 4y = 3(-5) + 4(6) = -15 + 24 = 9

Therefore, 3x+4y equals 9.