Solve the simultaneous equations
4x + 5y = 9
4x - 2y = 2

x = 1 and y = 1

Step-by-step explanation:

Let's solve your system by substitution.

4x + 5y = 9 ; 4x − 2y = 2

- Solve 4x + 5y = 9 for x:

4x + 5y = 9

4x + 5y + − 5y = 9 + − 5y (Add -5y to both sides)

4x = − 5y + 9

Then Substitute  for x in 4x - 2y = 2

4x − 2y = 2

4() − 2y = 2

− 7y + 9 = 2 (Simplify both sides of the equation)

− 7y + 9 + − 9 = 2 + − 9 (Add -9 to both sides)

− 7y = − 7

 (Divide both sides by -7)

y = 1

Substitute 1 for y in x =

x = 1

So, x = 1 and y = 1

a. 12.5 kg

step-by-step explanation:

f = ma

so

m = f/a = (2500 n)/(200 m/s²) = 12.5 kg

1 n = 1 kg·m/s²