Answer:
1.2x + 0.8y = 2.4
x = 5/3
y = 0.5
(please give brain if this helps or is correct)
Step-by-step explanation:
to solve an equation with 2 missing variable we must simplify then solve the equation
step 1: simplify the equation
ex: 1.2x + 0.8y = 2.4 (0.8y = -1.2x + 2.4)
step 2: divide all numbers by 0.8
ex: 0.8y/0.8 = -1.2x/0.8 + 2.4/0.8 (y = -1.5x + 3)
step 3: subtract 3 from both sides of the equation
ex: y - 3 = -1.5x + 3 - 3 (-3y = -1.5x)
step 4: divide both sides of the equation by -3
ex: -3y/-3 = -1.5x/-3 (y = 0.5)
step 5: plug in 0.5 into y then solve the original equation to find x
ex: 1.2x + 0.8(0.5) = 2.4
step 6: multiply 0.8 by 0.5
ex: 1.2x + 0.8(0.5) = 2.4 (1.2x + 0.4 = 2.4)
step 7: subtract 0.4 from each side of the equation
ex: 1.2x + 0.4 - 0.4 = 2.4 - 0.4 (1.2x = 2.0) or (1.2x = 2)
step 8: divide 1.2 from each side of the equation
ex: 1.2x/1.2 = 2/1.2 (x = 5/3)
step 9: input 5/3 into x and keep 0.5 as y then solve to check your answer
ex: 1.2(5/3) + 0.8(0.5) = 2.4
2 + 0.4 = 2.4
2.4 = 2.4 (if both sides of the equation have the same answer like 2.4 = 2.4 then you answer is true)
